No one cares to hear the "back in my day" shit from me, but back when I was an admin/mod I regularly closed the NFL thread down. It was awfully toxic and things could get really, really nasty. I would also thread ban any and everyone including guys I'm quite close with now.
I had to do the same thing with the MLB thread once or twice but it was not nearly as bad.
That was something that helped many years ago, and another big thing that helped is the fact that a lot of the guys that used to really instigate just don't post here anymore (I feel like I can name Son of Steinbrenner because he's long gone, LOL).