That guy with the puppets. I would have a comedy channel going on Pandora and when he would come on, I couldn't get to my phone fast enough to thumb him down.
For me though it's more a type. I like the ones that can tell stories, like Richard Pryor, Eddie Murphy, Ron White, etc. What I dislike are the "comics" whose only routine is ask the audience what they do for work and then insult them. That's not comedy, that's a high school bully.