The ones who also speak High English (British English? Newscaster English? Academic English? Something along these lines...) are, yes. From what I understand, most^ just use AAVE all the time and don't learn to speak High English.

^Disclaimer: I live in Eastern Europe, I've never met a Black person (I know many dark-skinned people, but they aren't negroes, ergo not Black), I've never even met an American, I may be wrong about the "most"