Its not just black kids anymore, but anyone who is young enough to think that "The street" is hip and cool. My teenage stepson (non-black) speaks full on ebonics at times, to me and his mother. We always correct him, he things I am being mean, tough sh*t. He also thinks it is racist to be against Ebonics, I tell him to shut his white boy mouth (Just kidding). No, actually, I tell him to listen to Samuel L. Jackson in Star wars. As a Jedi, he speaks perfect english, but dayum if dat guy can't whip out the Ebonics. There is a time and place for everything, and at home, you must be a Jedi...
Actually, I would be satisfied if he would just clean up his room...
I heard an interview with Will Smith on Fresh Air with Terri Gross on NPR. The majority of the interview consisted of how his mother forced him to speak proper english and that at the hint of the slightest slang he would be grounded for extended periods of time. No matter where he was when he was speaking. On the street with his friends his mom would over hear him using slang and she immediatly dragged him into the home and punished him.
I paid attention and I will be incorporating that into raising my children (when I have them). I will also incorporate a lesson I learned from Ken Hamblin in his book Pick A Better Country. He told of when he was young, his father would sit him down with the paper in the morning and show him the 'police beat' section and drill into his head that if his name ever appeared in there it would be an embarassment to himself and especially the family. It instilled in him a fear of having "his name in there" when he was growing up.
It is the only time i have ever heard of a parent doing that. Seems to me it would be a worthwile thing to do with young children.