It's an interesting phenomenon you don't see in other artistic performances. Comedy is the one realm where an audience will show up, uninformed by reviews or any research into who they're seeing perform (as opposed to say, watching a movie trailer, for example), and be so offended (and entitled) that they feel they must take public action against the performer directly.
A comedian's jokes may very well be unfunny to a group of people, but does that inherently give anyone the right to try to silence it from being said? And should a joke someone finds offensive cost a comedian opportunities in their career?