It's the nature of the beast, I'm afraid.
A few mild epithets are tolerable if an on-topic point is being made, but those who post simply to insult should go kick the dog (kidding) or something instead.
Then there are the Pavlovian responses to anything posted by a particular member. All a complete waste of bandwith.
A couple of other (once useful) boards were terminated by their owners recently because it all got too nasty.
Trick is to ignore the nuisance posts. Easier said than done of course if you happen to be the target.