It SEEMED like they were going to let a discussion go on until it got "uncivil," but that's not the issue at all.
It wasn't a violation that got that thread closed, it was "@fit" and "couch." If he hadn't done that, it probably would have gone on longer. The overtly fellating OP was being just as much of an instigator as anyone else, he just happened to have an opinion they want to hear right now.
Basically they censored him for being an IGX'er, since he was dumb enough to tip his hand. Amateurish trolling.