I really think that the trolling done by some detracts from what should be the spirit of any professional sport. That's why it's called "professional". And, the trolling comes in both flavors: trashing those visiting one's own site and going to another's site for the sake of trashing. Note that the former is not the same as trashing a competitor's team on your home site. That should just be expected, as should overstating one's own team's stature - on one's own site. There is a place for smashmouth and it is on one's own site. If you are going to visit another's site than you'd better have really thick skin and find some way to stay polite. You're in their house, so be respectful. And, I don't think anyone can say they aren't warned. Members on a board are pretty good about stating if someone's behavior is acceptable - or not. Banning is cute but leaves something to be desired.
Anyways, I was thinking that it might be nice to have all of the SBNations NFL sites vote on which board (and, maybe, some individual fans across all of the boards?) shows All_Pro behavior. No need for any list of acceptable behaviors, just voting. Heck, if it's entertaining smashmouth by individual fans, who knows, maybe people would vote for it!