The only comic I went to see was so vile, he physically repulsed me as well. I was with my now-husband, and got up during the show and told him I'd wait for him in the lobby! I could not believe how crass he was, and that people think this kind of stuff is funny? To me, Steve Martin and Tim Allen are funny...not crass, vulgar stuff.
I totally agree with your observation.
Crass for the sake of shock value isn't funny. Flinging the F bomb three times in every other sentence just tells me the comic has a hard time coming up with innovative material. David Brenner understood this and talked about this often.
I want to be entertained by a comedian. If I wanted twenty straight minutes of the F word, I'd go back to Freshmen year in High School and not have to pay a cover fee.