Because (and this is what I've heard in arguments for transgender) is that the mind can develop in a manner that would be suitable for a male/female, even if you are born with the anatomy of a female/male. Which isn't too far off from being believable. The male and female mind do tend to work in different ways. And thus, these people feel that they shouldn't be confined to a gender role based on the sex they were born with. (Quick info: sex is related to biological anatomy, gender is related to mental perception of oneself, I think). Anyway, so the theory is it's possible to have male sexual organs, but be born with a brain that developed in a manner that is effeminate. But this is strictly for binary genders, I don't understand any of this other stuff the LGBTQ(etc.) movement believes in regards to non-binary genders. However, race deals exclusively to skin color. Two white parents with pure white backgrounds cannot produce a black child without some fucked up mutations occurring, or outside intervention (I'd assume gene therapy, but I have no knowledge in that field, so take that with VERY little authority). However, ethnicity and culture is something that is taught. Black people tend to like A,B, and C while white people like X,Y, and Z (in America for example) because of their environmental culture. However, ones skin color does not define what ethnicity you are. Hence why black people in the UK do not dance around fires like African tribes, or act American ghetto. So, this lady is being disregarded because despite being white, she claims that she is "black". That she was born with a black mentality. But that's just stupid. Black people aren't born liking certain things. What she wants to identify with is the black American culture. Which isn't wrong of her. But to claim that she is being discriminated against because people are saying she is white, while she perceives herself as racially black, is borderline crazy. I hope that makes some sense