+> Some people I usually respect for their willingness to publicly die on a hill of facts, now seem to be talking as if pronouns are facts, or as if who uses what bathroom is necessarily a factual statement about chromosomes. Come on, you know the distinction better than that!
+>
+> _Even if_ somebody went around saying, "I demand you call me 'she' and furthermore I claim to have two X chromosomes!", which none of my trans colleagues have ever said to me by the way, it still isn't a question-of-empirical-fact whether she should be called "she". It's an act.
+>
+> In saying this, I am not taking a stand for or against any Twitter policies. I am making a stand on a hill of meaning in defense of validity, about the distinction between what is and isn't a stand on a hill of facts in defense of truth.
+>
+> I will never stand against those who stand against lies. But changing your name, asking people to address you by a different pronoun, and getting sex reassignment surgery, Is. Not. Lying. You are _ontologically_ confused if you think those acts are false assertions.
+
+Some of the replies tried explain the problem—and [Yudkowsky kept refusing to understand](https://twitter.com/ESYudkowsky/status/1067291243728650243)—
+
+> Using language in a way _you_ dislike, openly and explicitly and with public focus on the language and its meaning, is not lying. The proposition you claim false (chromosomes?) is not what the speech is meant to convey—and this is known to everyone involved, it is not a secret.
+
+—[repeatedly](https://twitter.com/ESYudkowsky/status/1067198993485058048):
+
+> You're mistaken about what the word means to you, I demonstrate thus: https://en.wikipedia.org/wiki/XX_male_syndrome
+>
+> But even ignoring that, you're not standing in defense of truth if you insist on a word, brought explicitly into question, being used with some particular meaning.
+
+Dear reader, this is the moment where I _flipped the fuck out_. Let me explain.
+
+This "hill of meaning in defense of validity" proclamation was just such a striking contrast to the Eliezer Yudkowsky I remembered—the Eliezer Yudkowsky whom I had variously described as having "taught me everything I know" and "rewritten my personality over the internet"—who didn't hesitate to criticize uses of language that he thought were failing to carve reality at the joints, even going so far as to [call them "wrong"](https://www.lesswrong.com/posts/FaJaCgqBKphrDzDSj/37-ways-that-words-can-be-wrong):
+
+> [S]aying "There's no way my choice of X can be 'wrong'" is nearly always an error in practice, whatever the theory. You can always be wrong. Even when it's theoretically impossible to be wrong, you can still be wrong. There is never a Get-Out-Of-Jail-Free card for anything you do. That's life.
+
+[Similarly](https://www.lesswrong.com/posts/d5NyJ2Lf6N22AD9PB/where-to-draw-the-boundary):
+
+> Once upon a time it was thought that the word "fish" included dolphins. Now you could play the oh-so-clever arguer, and say, "The list: {Salmon, guppies, sharks, dolphins, trout} is just a list—you can't say that a list is _wrong_. I can prove in set theory that this list exists. So my definition of _fish_, which is simply this extensional list, cannot possibly be 'wrong' as you claim."
+>
+> Or you could stop playing nitwit games and admit that dolphins don't belong on the fish list.
+>
+> You come up with a list of things that feel similar, and take a guess at why this is so. But when you finally discover what they really have in common, it may turn out that your guess was wrong. It may even turn out that your list was wrong.
+>
+> You cannot hide behind a comforting shield of correct-by-definition. Both extensional definitions and intensional definitions can be wrong, can fail to carve reality at the joints.
+
+One could argue the "Words can be wrong when your definition draws a boundary around things that don't really belong together" moral doesn't apply to Yudkowsky's new Tweets, which only mentioned pronouns and bathroom policies, not the [extensions](https://www.lesswrong.com/posts/HsznWM9A7NiuGsp28/extensions-and-intensions) of common nouns.
+
+But this seems pretty unsatifying in the context of his claim to ["not [be] taking a stand for or against any Twitter policies"](https://twitter.com/ESYudkowsky/status/1067185907843756032). One of the Tweets that had recently led to radical feminist Meghan Murphy getting [kicked off the platform](https://quillette.com/2018/11/28/twitters-trans-activist-decree/) read simply, ["Men aren't women tho."](https://archive.is/ppV86) This doesn't seem like a policy claim; rather, Murphy was using common language to express the fact-claim that members of the natural category of adult human males, are not, in fact, members of the natural category of adult human females.
+
+If the extension of common words like 'woman' and 'man' is an issue of epistemic importance that rationalists should care about, then presumably so is Twitter's anti-misgendering policy—and if it _isn't_ (because you're not standing in defense of truth if you insist on a word, brought explicitly into question, being used with some particular meaning) then I wasn't sure what's _left_ of the "Human's Guide to Words" sequence if the [37-part grand moral](https://www.lesswrong.com/posts/FaJaCgqBKphrDzDSj/37-ways-that-words-can-be-wrong) needs to be retracted.
+
+I think I _am_ standing in defense of truth if have an _argument_ for _why_ my preferred word usage does a better job at "carving reality at the joints", and the one bringing my usage explicitly into question doesn't have such an argument. As such, I didn't see the _practical_ difference between "you're not standing in defense of truth if you insist on a word, brought explicitly into question, being used with some particular meaning", and "I can define a word any way I want." About which, again, a previous Eliezer Yudkowsky had written:
+
+> ["It is a common misconception that you can define a word any way you like. [...] If you believe that you can 'define a word any way you like', without realizing that your brain goes on categorizing without your conscious oversight, then you won't take the effort to choose your definitions wisely."](https://www.lesswrong.com/posts/3nxs2WYDGzJbzcLMp/words-as-hidden-inferences)
+>
+> ["So that's another reason you can't 'define a word any way you like': You can't directly program concepts into someone else's brain."](https://www.lesswrong.com/posts/HsznWM9A7NiuGsp28/extensions-and-intensions)
+>
+> ["When you take into account the way the human mind actually, pragmatically works, the notion 'I can define a word any way I like' soon becomes 'I can believe anything I want about a fixed set of objects' or 'I can move any object I want in or out of a fixed membership test'."](https://www.lesswrong.com/posts/HsznWM9A7NiuGsp28/extensions-and-intensions)
+>
+> ["There's an idea, which you may have noticed I hate, that 'you can define a word any way you like'."](https://www.lesswrong.com/posts/i2dfY65JciebF3CAo/empty-labels)
+>
+> ["And of course you cannot solve a scientific challenge by appealing to dictionaries, nor master a complex skill of inquiry by saying 'I can define a word any way I like'."](https://www.lesswrong.com/posts/y5MxoeacRKKM3KQth/fallacies-of-compression)
+>
+> ["Categories are not static things in the context of a human brain; as soon as you actually think of them, they exert force on your mind. One more reason not to believe you can define a word any way you like."](https://www.lesswrong.com/posts/veN86cBhoe7mBxXLk/categorizing-has-consequences)
+>
+> ["And people are lazy. They'd rather argue 'by definition', especially since they think 'you can define a word any way you like'."](https://www.lesswrong.com/posts/yuKaWPRTxZoov4z8K/sneaking-in-connotations)
+>
+> ["And this suggests another—yes, yet another—reason to be suspicious of the claim that 'you can define a word any way you like'. When you consider the superexponential size of Conceptspace, it becomes clear that singling out one particular concept for consideration is an act of no small audacity—not just for us, but for any mind of bounded computing power."](https://www.lesswrong.com/posts/82eMd5KLiJ5Z6rTrr/superexponential-conceptspace-and-simple-words)
+>
+> ["I say all this, because the idea that 'You can X any way you like' is a huge obstacle to learning how to X wisely. 'It's a free country; I have a right to my own opinion' obstructs the art of finding truth. 'I can define a word any way I like' obstructs the art of carving reality at its joints. And even the sensible-sounding 'The labels we attach to words are arbitrary' obstructs awareness of compactness."](https://www.lesswrong.com/posts/soQX8yXLbKy7cFvy8/entropy-and-short-codes)
+>
+> ["One may even consider the act of defining a word as a promise to \[the\] effect [...] \[that the definition\] will somehow help you make inferences / shorten your messages."](https://www.lesswrong.com/posts/yLcuygFfMfrfK8KjF/mutual-information-and-density-in-thingspace)
+
+One could argue that this is unfairly interpreting Yudkowsky's Tweets as having a broader scope than was intended—that Yudkowsky _only_ meant to slap down the specific false claim that using 'he' for someone with a Y chromosome is lying, without intending any broader implications about trans issues or the philosophy of language. It wouldn't be realistic or fair to expect every public figure to host a truly exhaustive debate on all related issues every time a fallacy they encounter in the wild annoys them enough for them to Tweet about that specific fallacy.
+
+However, I don't think this "narrow" reading is the most natural one. Yudkowsky had previously written of what he called [the fourth virtue of evenness](http://yudkowsky.net/rational/virtues/): "If you are selective about which arguments you inspect for flaws, or how hard you inspect for flaws, then every flaw you learn how to detect makes you that much stupider." He had likewise written [of reversed stupidity](https://www.lesswrong.com/posts/qNZM3EGoE5ZeMdCRt/reversed-stupidity-is-not-intelligence) (bolding mine):