> I don't understand how you reach this conclusion given the fact that for >99% of the world's people, their gender matches their sex.
What is the significance of this in this context? 100% of the world's people are not lions, does that mean lions don't exist? Some people don't fit neatly into one of the two gender/sex categories. This is scientifically very clear. Why is it important to have hard categories, and why should we legislate that only two categories exist?
> 100% of the world's people are not lions, does that mean lions don't exist
No, 100% of the world's people are not lions, therefore people are not lions.
> people don't fit neatly into one of the two gender/sex categories
Don't conflate gender and sex. All people fit into sex categories because all people have a definite sex, and sex allows for a range of development, even malformed ones.
As for "gender", if it's defined separately from sex, then I don't know what it means because it hasn't been defined. My response was that the vast majority of people don't distinguish between gender/sex, because not only have they never encountered a person where these are distinct, they don't even have any inclination that this is even a thing. That's why I'm confused by the original claim that "nobody" thinks gender comes down to sex. It's just a bizarre claim. If you go to remote tribes in the Amazon, even they think gender and sex are the same.
If you go to remote tribes in the Amazon, you'll find a lot of things modern day society tries to distance itself from, like kidnapping women and beating them until they're docile. You have literally no idea what those people were to think of themselves, given the freedom to do so. Ancient is not the same as good.
> Here's some other "ancient" stuff, that can be used to say the opposite of your point
Yes, native Americans had gay people too, and slightly varying ideas of division of labour. I'm not sure how you think this proves the notion that distinguishing gender and sex is or was some dominant mode of thought.
Just look up transgender history on Wikipedia, literally the opening paragraph says these concepts were invented in the 1950s.
> All people fit into sex categories because all people have a definite sex
I mean, no? Not really? There's a whole history of people who do not have a definite sex, and even then, there are lots of people who appear to have a definite sex but their body is varied massively from the "baseline". Such people are actually more numerous than red-headed people or albinism, within society. All of this is pretty trivial in terms of talking points and very well supported within the encompassing scientific literature, which is why I don't actually feel the need to cite myself here — any introduction to biological psychology, or the general subject of sex/gender, from a biological or sociological view, will very easily get you up to speed on this.
> I mean, no? Not really? There's a whole history of people who do not have a definite sex
Phenotypical sex characteristics do not define sex, and developmental disorders tied to one's sex do not somehow refute one's sex. This talk of "appearances" is exactly the kind of confusion I've been trying to argue against. Biology has a more rigourous definition for sex to avoid exactly these confusions. I do acknowledge that even some biologists have fallen into this trap lately, to our detriment.
The tl;dr of it is "the bimodal sex distribution model is really bad at a lot of the things we use it for, including predicting results to prescribed medication, or questions about who can give birth". There's some links to actual papers included in the gallery, if you want to follow this up further.
> I do acknowledge that even some biologists have fallen into this trap lately, to our detriment.
From 'knowing people in the field of biology', I can say rather clearly that it's less "some biologists are mistaken/foolish" and more "the majority of biologists who are up to date have decided to revise their beliefs about sex in line with current research".
What is the significance of this in this context? 100% of the world's people are not lions, does that mean lions don't exist? Some people don't fit neatly into one of the two gender/sex categories. This is scientifically very clear. Why is it important to have hard categories, and why should we legislate that only two categories exist?