I ask them nicely to stop first. My reasoning is that it ruins gameplay for many people. Trust me on this one...If I don't moderate it somewhat lots of players leave out of frustration and I end up with a server full of people spamming moves and in general not really playing the game but rather just ganking away.
A lot of players that get kicked (after warnings) usually come back and bitch. If they want I discuss it with them. Sometimes they stay and play, sometimes they don't.
Anyway Vestril, my posts really aren't directed at you...it's mostly for the foul-mouthed and spiteful folks that made some rather viscious and nasty remarks.