In case anyone is genuinely confused: this is the kind of bigotry people expect to get away with sans consequence, and complain about “heresy” when they’re called out on it.
Somewhere in the last 10 years a norm emerged that transgender identity is sacrosanct and its doubters are bigots, but transracial identity is a lie and people like Rachel Dolezal are frauds.
GP's brusque language aside, can there be any amount of uncertainty on either of these points? Doesn't it seem a bit arbitrary that these two new norms are opposite to each other?
Even though gender and race are both social inventions, they’re not really interchangeable like that.
To cite one example: race is considered heritable, and there have historically been harsh consequences of that lineage. In the US, the one-drop rule ensured that anyone with even a single Black ancestor would be subject to the legal discrimination that status entailed (this is called “hypodescent”). So the idea of someone saying “I identify as Black” is… fraught, to say the least.