Female comedians. They are all terrible, I have yet to see one that is genuinely funny. Not trying to be sexist but it's true, women are not funny. I always watch stand up shows, some middle aged single woman comes on, and their act can be summed up 99% of the time by this: "PMS lol! I love chocolate, I hate girls who are prettier than me, PMS lol!" With the occasional "men suck" joke if they are particularly feminist/lesbian. The audience seems to agree with me too, no-one really laughs except the occasional chuckle, probably out of sympathy. I'm not sexist in any way at all, but women, know your limits, stay out of comedy clubs. So yeah, what grinds your gears?