97% of the black people I have ever known have spoken proper English. Of course they all have jobs. Go figure!
I work with a lot of black folks in the navy. Many of the blacks in the military enlisted to escape the 'hood and make something with their lives.
The other day in my shop I was privy to a conversation between two black navy chiefs debating the merits of giving their kids "normal" (i.e. "white") names. One of the chiefs made the comment, "I don't want to give my kid a name where when he fills out a job application it's going to go straight into the trash."
They then proceeded to make fun of all their relatives and the crazy black names they've given their kids.