I agree. And the "hecklers" telling him he isn't funny, insulting his act, and calling him a "MF" was meant to do the same thing.
There are no innocent parties in this altercation, and neither's actions were justified. But only one has been called out for publich humiliation, and that is the double standard that has become so tiresome.
I don't see calling someone not funny equivalent to using a racial slur. One only applies to that particular person, one is an insult to everyone in that particular race. One is criticism of his choice of jokes, the latter an attack over something that no one has any control over.