I agree Dane Cook can be annoying. Then there is Jesse Jackson and Al Sharpton who go off and tell Kramer (Michael Richards) to go for anger managment. Banning a word is not going to change anything only that it is Club Policy that you refrain from the "N" word and that is about it.
I met a comedian a couple of months ago Rose Marie from Hollywood Squares and the Dick Van Dyke show. She mentioned all this and her thinking was that a "Seasoned Comedian" would try to get the audience behind them for the person heckling the comedian on stage and in return this would embarass that person yelling out whatever it may be. She also mentioned that basically Michael Richards ruined his career as a stand up and should basically give it up.
I have to been to some comedy clubs and have experienced hecklers and all in return they are removed after some time and the show goes on. But a seasoned comedian just also adds them in on jokes and it makes that person more unlikely to continue.
It was quite obvious that Michael Richards is no seasoned stand up and needs to learn how to handle hecklers.