Whatever the outcome, if blacks want to survive in a dominant culture, then they must learn the dominant culture. Blacks have sight into what might otherwise be the psyche of an alien. Sight is a marvelous thing when you're dealing with a complicated world. You can close that deal and win that case if you're talking the language of white America. To be accepted, whites don't have to learn a walk, an idiom, nothing.
Whites just mimic the folks on television, their teachers, and their family.
They already speak the language of the majority, which doesn't do a thing about helping them comfortably negotiate an increasingly diverse world. Conversely, outside the realm of gangsta rap, successful blacks must learn a language, a walk, a way of being that allows them to pass. They must put on their game face or their white voice to lessen the distance between themselves and their conquerors. Forget the morality of racial understanding. On a purely practical level, the kind of sight forced on blacks is an advantage.