I agree in principle, but I think it might be worth the effort to examine why it's different. Flat denunciation of the proposed equivalency with no explanation of the reasoning is unconvincing.
I've touched upon the reasons already,k but given that Darat tried to dismiss my post without any explanation, I don't think he really deserved any more in response.
But OK, let's go into this a bit more. Race is pretty superficial. Outside of some pretty narrow circumstances (for example,
Julia Roberts shouldn't play Harriet Tubman), race shouldn't matter at all.
But sex isn't equivalent. Sex matters. Sex determines, well,
sex. The biological category is inseparable from the act. And I don't mean that males can or should only have sex with females and vice versa. I mean that sexual orientation matters. As Andrew Sullivan said, "But if a gay man doesn’t want to have sex with someone who has a vagina and a lesbian doesn’t want to have sex with someone who has a dick, they are not being transphobic. They’re being — how shall I put this? — gay." The dangly bits you have determine what kind of sex you can have with other people. And since people have preferences about what kind of dangly bits they want their dangly bits to dangle together with, preferences which are not superficial but very deep seated, this ends up affecting our interactions with each other in deep and personal ways.
There are contexts in which these differences aren't supposed to matter, where our sexual desires aren't supposed to come into play. I shouldn't be considering sexual desires when hiring a cashier. But there are other contexts, particularly ones involving a state of undress, where it's going to matter, where you can't simply pretend the issue of sex (both the category and the act) is irrelevant. This is also an asymmetric situation, since sexual desires manifest differently in men and women. On average, males are more easily sexually aroused than females, they pay a lower opportunity cost for having sex, and they have significantly more strength. These factors combine to make the risk of sexual assault from men against women particularly pronounced in situations where women are undressed around unfamiliar men, such as coed changing rooms. That is why we segregate based on sex.
There is no equivalent dynamic with race.