What's the best way to respond to someone who says "transracial is just as valid as transgender"? (Transracial referring to people who identify as another race like Rachel Dolezal)

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)