[SarSerceSaice]

I don't know how widespread it is, but its root cause, imo, is black hatred of whites. Whites are the hated "enemy" so it's seen as very important to attack everything the hated enemy does and differentiate yourself from it: the way he talks, the way he dresses, his music, his literature, his humor, his customs, etc. So whenever a black does anything the way that it is thought a white would do it he is attacked by his peers for it, because it's seen as a form of betrayal.