Second thing I should say is that the following is entirely a personal opinion and so should be taken as that an expression of an opinion not some attempt to impose my standards on anyone else.
Bad Language:
At the age of 56 I seen and heard most things, very little upsets or offends me, I do however find some of the language I heard used on Sloth in recent months unpleasant and uneccessary.
Normally I ignor bad language, however I think players should remember that this isn't (to the best of my knowledge) an adults only game.
Language that may be acceptable to your age group and in your culture may not be acceptable to everyone playing.
I was recently playing and in BH scribes a player was coming out with such a stream of foul language (using say) that I typed 'sayed' "language please!" the response I got was (and I paraphrase here) that it wasn't on an open channel so they'd say what the **** they wanted to ****ing say, there was no ****ing rule against it.
This I felt was extreme but I didn't feel arguing would help anything, nor did I want to open myself to more verbal abuse so I left and rented.
In my opinion however 'say' is an open channel, and it makes little difference about the 'open/closed' arguement anyway unless you personally know all others in any 'closed' channel and know they won't be offended.
Trolling:
Trolling or flaming a player is to my mind deliberately attempting to start an arguement or wind someone up.
To a certain extent this is funny and I think is seen my all to be so, however there are occasions that it gets out of hand.
To give an example:
I recently popped a hard to pop spellbook, I didn't need it so I gossiped anyone need ----- sb?
I got a lot of response the first of which was a tell, the next a gossip, in that situation I don't respond to tells so I gossiped back who got it ... the first gossiper. Took the book to them and gave it to them.
The teller, then got upset, telled me repeatedly saying they had 'won' as they'd responded first and I now 'owed them' the book. That I should know the rules of the game and that offering the book on gossip was a contract and I was in breach of contract by not giving to them (mud lawyers eh?) ... this followed by an hours worth of more such nonsense, including visioning, following, trying to loot my kills etc. Most of this time I just ignored them and let them get on with it, when I challenged their behaviour the response I got basically boiled down to I owed them the book, they'd carry on til I gave it to them and there was no rule against what they were doing.
Now if that was another player I knew and had a friendship with it might have been (at least to start with) funny and be seen as friendly banter or teasing, as it was, it was extrememly annoying, so context is as important here as action.
I don't think for either of the above it would be possible to be prescriptive about what what language/behaviour is and isn't acceptable, but I would be in favour of a general rule or statement saying that players should act responsibly and respectfully towards all other players and that offensive and abusive language or behaviour isn't welcome.
Sorry this got so long ... didn't realise I had such a soap box

Anyways as I said, my opinion, take it or leave it as you wish.
Also to reiterate this isn't as far as I can see a widespread problem, the vast majority of players do act responsibly at all times, its just annoying when it does happen.