OK, I get it. We want to play nice. We don't want to offend each other. And I don't think I've posted anything unforgivable myself.
That said, it's not so simple, is it? Sometimes, it is most appropriate to say, "That is fucktarded!" Remember somebody's suggestion that we "masturbate while watching Maury"? Aren't there some of us who bristle every time we see the word "sh*t" on this page, because it reminds us of that stuff in the toilet? At my school, the most offensive thing is probably that adjuncts get paid easily less than 20% of the f-t proffies for doing the same work, and yet the mindset (which is replicated on this page sometimes) that allows that corruption* is often politely encouraged in spite of its offensiveness. Maybe you're offended by the rabid, irrational anti-creationism rants. Personally, I'm more offended when my colleagues are unable to precisely define plagiarism and articulate why it's wrong than when my snowflakes actually plagiarize.
So here's a tough thirsty that seems self-contradictory, but actually is not (I hope**):
Q. Honestly, what is the most offensive thing you've ever seen on CM (something you wish you never had to see here ever again)?
A. Feel free to censor yourself in creative ways, use codewords and circumlocution, bleep things (e.g., "sh*t"), and so on.
*I don't know if this is the appropriate word. So what.
**Fab, please don't kill me.