Edit for context:
My view is transracial isn’t valid and this person is trying to dogwhistle. I’ve already blocked this person, and now they’re going after my friend saying my friend is transphobic because they disagreed with them about transracial being a thing (they’re purposefully leaving the context out so my friend looks transphobic when what my friend really said was transgender is valid but transracial isn’t)
Gender isn’t biological. You’re conflating with sex
Well trans people, if they medically transition, quite literally change their sex.
If they don’t, they’re still transitioning their gender. Exactly how much they decide to change themselves doesn’t matter. That’s the point of the term.