Jeff - a small group of people, or sometimes just one individual, comes in and replies to EVERY post with obnoxious, personal, inflammatory, vulgar crap. The group tries to ignore it for awhile, after too much of this it becomes impossible and the group disperses.
Sounds simple to combat. It's not.
Ask Craig, John V, Dan King, Bob Huntley, many others... we have seen this scenario several times.
TH