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)
The best way to respond is to disregard them, block and move on. Transracial is an actual thing, but it refers to people of one race adopted by another. Transracial ala Dolezal is just a troll to attack trans people, no different from attack helicopters.