If you don't want to be a black hack, don't do it. The Black Hack and Whitey Many blacks perform before mixed race or all white audiences. Society has put an unnatural tension between white audiences and black comics. Some black comedians play upon this well. Others are just black hacks.
Black hacks like to play upon the threat of violence.
This hack works really well if the comic is about as threatening as Gary Coleman. Sometimes a black hack can lose a white audience when they get into using jive. A good way to pull them back is by telling them not to listen. I'm not sure who started it, but Shirley Hemphill is the first I saw do it. It works pretty well.