I actually find the body mod episode hilarious, but that's probably because I don't have a dick that could hypothetically be mutilated. The episodes I have the biggest problem with are the Stupid And Entitled ones. Unschooling, that demon kid, multiples, and PUAs are all territory I either will never listen to again or never bothered to in the first place. They just irritate the fuck out of me (although the FA one is an exception, weirdly enough). That, and I will concede that the bug episode was the point when you guys finally managed to gross me out.
I also never downloaded the Sherlock fanfiction episode because I actually like that show, but the fandom creeps me right the hell out, sometimes.