Why do the low rent black people on talk shows repeat the same thing over and over?

they pick some inane phrase like "and what?" or "he the daddy!" and just repeat it over and over, usually loudly, no matter what anyone else says. i don't think i've ever seen a white person do this, though i'm sure there are some who have. so what's the deal with that? do they think that repetition makes what they're saying less stupid?