Yes, it is. I’m on board with what you’re saying about gender. I’d say the same things about race, and apparently you would not. Mine is certainly not an established belief with regards to race, but that’s not particularly relevant. Presumably you would not say that in 1975, trans women were not women just because back then it was not widely understood that such was the case. So these matters aren’t subject to a popular vote. The fact that I’m expressing an opinion about race that’s not common doesn’t make it wrong. And there’s no reason not to extend the same kind of understanding about a person’s authority to define their Selves in terms of these social categories called “race” that we have extended and recognized with regards to gender.
Neither race nor gender exist except as social constructs.