Throughout history in the theater and film people do like...

Throughout history in the theater and film people do like sarcastic characters, and they do like curmudgeons - if they're amusing, they do like them despite the fact that they're vitriolic, particularly if they're for the right thing. If you can see that the person is a decent person and is for the right thing, and is not just a nasty person with base motives, but someone who is a decent human but expresses himself.