In reverse, look what happens when an inner city teacher subs at a mostly white school: http://www.youtube.com/watch?v=Dd7FixvoKBw
I saw that when it aired, funny stuff. I had an old Black teacher who had been around for the pre-1960s segregated system (this was in 1984). He was completely incomprehensible (one, he was hard to understand because of his age, and two, his Southern-fried ebonics) and teaching to a forced-integration class of mostly Whites whom were bused in from the suburbs. The principal had to move me out of his class because there was no way I could learn (he was teaching English, btw).