I know I'm going to sound like some overly sensitive wuss who should find another forum, but he's just being offensive. He's being openly racist at the expense of audience members (who weren't heckling or doing anything but paying to listen to him and have a good time), and he's doing it just to get some cheap laughs. He made fun of the deaf people at the beginning, too.
I don't know, maybe that's his comedic style and that's what his audience expects and pays for. But it sure didn't sit well with me.