+... not _actually_ inexplicable. There was, in fact, an obvious explanation: that Yudkowsky was trying to bolster his reputation amongst progressives by positioning himself on the right side of history, and was tailoring a fake rationality lesson to suit that goal. But _Eliezer Yudkowsky wouldn't do that_. I had to assume this was a honest mistake.
+
+At least, a _pedagogy_ mistake. I of course agree that pronoun usage conventions, and conventions about who uses what bathroom, are not, themselves, factual assertions about sex chromosomes in particular. But it's _bizarre_ to condescendingly point this out as if it were the crux of contemporary trans-rights debates.
+
+
+
+
+
+Conservatives and gender-critical people
+
+
+
+
+But the question of what categories epistemically "carve reality at the joints", is _not unrelated_ to the question of which categories to use in policy decisions! Connotatively, and in the context of elite intellectual American culture in which "trans women are women" is dogma, it's hard to read the Tweets Yudkowsky published as anything other than an attempt to intimidate and delegitimize people who want to use language to reason about sex rather than gender identity. [For example](https://twitter.com/ESYudkowsky/status/1067490362225156096), deeper in the thread, Yudkowsky wrote:
+
+> The more technology advances, the further we can move people towards where they say they want to be in sexspace. Having said this we've said all the facts. Who competes in sports segregated around an Aristotelian binary is a policy question (that I personally find very humorous).
+
+Sure, _in the limit of arbitrarily advanced technology_, everyone could be exactly where they wanted to be in sexpsace. Having said this, we have _not_ said all the facts relevant to decisionmaking in our world, where _we do not have arbitrarily advanced technology_. As Yudkowsky [acknowledges in the previous Tweet](https://twitter.com/ESYudkowsky/status/1067488844122021888), "Hormone therapy changes some things and leaves others constant." The existence of HRT does not take us into the Glorious Transhumanist Future where everyone is the sex they say they are.
+
+Rather, previously sexspace had two main clusters (normal females and males) plus an assortment of tiny clusters corresponding to various [disorders of sex development](https://en.wikipedia.org/wiki/Disorders_of_sex_development), and now it has two additional tiny clusters: females-on-masculinizing-HRT and males-on-feminizing-HRT. Certainly, there are situations where you would want to use "gender" categories that use the grouping {females, males-on-feminizing-HRT} and {males, females-on-masculinizing-HRT}.
+
+But the _reason_ for having sex-segregated sports leagues is because the sport-relevant multivariate trait distributions of female bodies and male bodies are quite different.
+
+[TODO: relevance of multivariate—
+
+Different traits have different relevance to different sports; the fact that it's apples-to-oranges is _why_ women do better in ultraswimming—that competition is sampling a corner of sportspace where body fat is an advantage
+
+It's not that females and males are exactly the same except males are 10% stronger on average
+
+It really is an apples-to-oranges comparison, rather than "two populations of apples with different mean weight"
+
+https://www.lesswrong.com/posts/cu7YY7WdgJBs3DpmJ/the-univariate-fallacy
+https://www.lesswrong.com/posts/vhp2sW6iBhNJwqcwP/blood-is-thicker-than-water
+
+If you just had one integrated league, females wouldn't be competitive (in almost all sports, with some exceptions [like ultra-distance swimming](https://www.swimmingworldmagazine.com/news/why-women-have-beaten-men-in-marathon-swimming/)).
+]
+
+[TODO: sentences about studies showing that HRT doesn't erase male advantage
+https://twitter.com/FondOfBeetles/status/1368176581965930501
+https://link.springer.com/article/10.1007/s40279-020-01389-3
+https://bjsm.bmj.com/content/55/15/865
+]
+
+[TODO sentences about Lia Thomas and Cece Tefler https://twitter.com/FondOfBeetles/status/1466044767561830405 (Thomas and Tefler's feats occured after Yudkowsky's 2018 Tweets, but this kind of thing was easily predictable to anyone familiar with sex differences—cite South Park)
+https://www.dailymail.co.uk/news/article-10445679/Lia-Thomas-UPenn-teammate-says-trans-swimmer-doesnt-cover-genitals-locker-room.html
+https://twitter.com/sharrond62/status/1495802345380356103 Lia Thomas event coverage
+https://www.realityslaststand.com/p/weekly-recap-lia-thomas-birth-certificates Zippy inv. cluster graph!
+https://www.swimmingworldmagazine.com/news/a-look-at-the-numbers-and-times-no-denying-the-advantages-of-lia-thomas/
+]
+
+Given the empirical reality of the different multivariate trait distributions, "Who are the best athletes _among females_" is a natural question for people to be interested in, and want separate sports leagues to determine. Including male people in female sports leagues undermines the point of having a separate female league.
+
+(Similarly, when conducting [automobile races](https://en.wikipedia.org/wiki/Auto_racing), you want there to be rules enforcing that all competitors have the same type of car for some common-sense-reasonable operationalization of "the same type", because a race between a sports car and a [moped](https://en.wikipedia.org/wiki/Moped) would be mostly measuring who has the sports car, rather than who's the better racer.)
+
+In light of these _empirical_ observations, Yudkowsky's suggestion that an ignorant comittment to an "Aristotelian binary" is the main reason someone might care about the integrity of women's sports, is revealed as an absurd strawman. This just isn't something any scientifically-literate person would write if they had actually thought about the issue _at all_, as contrasted to having _first_ decided (consciously or not) to bolster one's reputation among progressives by dunking on transphobes on Twitter, and wielding one's philosophy knowledge in the service of that political goal. The relevant empirical facts are _not subtle_, even if most people don't have the fancy vocabulary to talk about them in terms of "multivariate trait distributions".
+
+Yudkowsky's pretension to merely have been standing up for the distinction between facts and policy questions isn't credible: if you _just_ wanted to point out that the organization of sports leagues is a policy question rather than a fact (as if anyone had doubted this), why would you throw in the "Aristotelian binary" strawman and belittle the matter as "humorous"? There are a lot of issues that I don't _personally_ care much about, but I don't see anything funny about the fact that other people _do_ care.
+
+(And in this case, the empirical facts are _so_ lopsided, that if we must find humor in the matter, it really goes the other way. Lia Thomas trounces the entire field by _4.2 standard deviations_ (!!), and Eliezer Yudkowsky feels obligated to _pretend not to see the problem?_ You've got to admit, that's a _little_ bit funny.)
+
+Writing out this criticism now, the situation doesn't feel _confusing_, anymore. Yudkowsky was very obviously being intellectually dishonest in response to very obvious political incentives. That's a thing that public intellectuals do. And, again, I agree that the distinction between facts and policy decisions _is_ a valid one, even if I thought it was being selectively invoked here as an [isolated demand for rigor](http://slatestarcodex.com/2014/08/14/beware-isolated-demands-for-rigor/) because of the political context. Coming from _anyone else in the world_, I would have considered the thread fine—a solidly above-average performance, really. I wouldn't have felt confused or betrayed at all. Coming from Eliezer Yudkowsky—it was confusing.
+
+Because of my hero worship, "he's being intellectually dishonest in response to very obvious political incentives" wasn't in my hypothesis space; I _had_ to assume the thread was an "honest mistake" in his rationality lessons, rather than (what it actually was, what it _obviously_ actually was) hostile political action.
+
+I was physically shaking. I remember going downstairs to confide in a senior engineer about the situation. I had to do _something_. But if Yudkowsky was _already_ stonewalling his Twitter followers, entering the thread myself didn't seem likely to help.
+
+[TODO: I had his email address, and I didn't think I had the right to demand his attention, so I threw in another $1000 cheerful price (and cc'd Michael and "Erin Burr") just to read it—]