Comedians are artists and should enjoy to have artistic freedom and freedom of speech. That freedom of should be protected. If you don't like a certain comedian, simply don't watch his shows. If we are going to restrict what a comedian can and can't say on the basis of being offensive, we are going down a really slippery road. These days a lot of people will find something offensive.
If being offensive is the basis we can say farewell to jokes about: sex/gender, religion, cultural groups, body shape and all stereotypes. If we would remove all jokes that could be considered offensive to someone, the shows will be awfully short. Because if offense is the basis, basically all offense is equally valid.
Please excuse my (probally) poor grammar
