AAVE is not a strictly racial category, it's not like some people are predisposed to speak it due to their skull shape or whatever. It's social chauvinism to misappropriate a dialect that isn't one you were socialized into, but there are white people who are socialized into AAVE, African Americans who are not socialized into AAVE, and also, rarely, uses of it that aren't misappropriation (e.g. linguistic studies, to use the safest possible example).