Unless there's actual evidence that agents actually do these things in forums, I'm inclined to believe that what we're seeing are not COINTELPRO techniques, but rather the product of how schizophrenic, frivolous and unfocused people become on the Internet.
RPFs look just like the forums everywhere else, even the ones that aren't about politics. Hyperventilation over non-issues, the overblowing of real issues, bitter fights over petty differences, the unfortunate creep down the page of good topics as other users re-post new ones to get on the front page... They happen elsewhere just as much as they do here.
I doubt anyone outside the movement cares a great deal about what happens on the forums. As long as you're indoors, on the Internet, posting on a forum, you pose no threat to the status quo.