+In that context, it's grimly amusing that in this post attempting to explain why the original thread seemed like a reasonable thing to say, Yudkowsky ... doubles down on going out of his way to avoid acknowledging the reality of biological of sex. He learned nothing! We're told that the default pronoun for those who haven't asked goes by "gamete size."
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+But ... I've never _measured_ how big someone's gametes are, have you? We can only _infer_ whether strangers' bodies are configured to produce small or large gametes by observing [a variety of correlated characteristics](https://en.wikipedia.org/wiki/Secondary_sex_characteristic). Furthermore, for trans people who don't pass but are visibly trying to, one presumes that we're supposed to use the pronouns corresponding to their gender presentation, not their natal sex.
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+Thus, Yudkowsky's "default for those-who-haven't-asked that goes by gamete size" clause _can't be taken literally_. The only way I can make sense of it is to interpret it as a way to point at the prevailing reality that people are good at noticing what sex other people are, but that we want to be kind to people who are trying to appear to be the other sex, without having to admit to it.
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+One could argue that this is hostile nitpicking on my part: that the use of "gamete size" as a metonym for sex here is either an attempt to provide an unambiguous definition (because if you said _female_ or _male sex_, someone could ask what you meant by that), or that it's at worst a clunky choice of words, not an intellectually substantive decision that can be usefully critiqued.
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+But the claim that Yudkowsky is only trying to provide an unambiguous definition isn't consistent with the text's claim that "[i]t would still be logically rude to demand that other people use only your language system and interpretation convention in order to communicate, in advance of them having agreed with you about the clustering thing". And the post also seems to suggest that the motive isn't to avoid ambiguity. Yudkowsky writes: