The official rules are pretty clear.
Trem is an open environment, I think it would be a bad precedent to start censorship on a qualitative basis rather than the quantitative basis. Right now the rules prohibit spamming, harassment, and griefing. Spamming and harassment are pretty self-explanatory. Griefing specifically targets the folks who bitch and whine.
Trying to censor based on content seems ill advised, and not really all that necessary.
That said, administration of a public server, done right, is a PITA. Ultimately it has to take priority to your own gaming enjoyment. A good litmus test is: Is this for the server or for Me?
I think some admins even take it further than simply using their administration commands. Taking the time to try and teach newbies, add balance to the game, or even quit playing to spectate and make sure folks are behaving themselves are really good things that should be encouraged.
Finally, it seems to make sense rather than admins being a sole source of censorship (a position I think most would avoid anyway), if you really are annoyed by what someone is saying or has binded, callvote mute. Its quite effective even when call_vote unmute is called within a minute...it lets the individual know that the majority of the server is annoyed by what they say.
That said...I add RATFARTS!
mm69