Every time a guy starts spamming, shouting needless profanities or anything else you dont wanna hear....
DO NOT tell him to stop or to shut up. Your merely encouraging him, as his goal is to annoy others. Everytime someone else tells him to shut up its like he has captured another req point :P
Instead look to the LEFT of players names in chat. There is a small white wing outlined in green. If you click it twice, it will turn into a large red letter I. This means ignore and whatever that person says will no longer show up on your screen. Sadly this wasnt in the rulebook and many people ask how to ignore others.
Hopefully this will cut down on the frustration many folks feel in chat when the spammers start up.