Like a fight just because of football. Nothing other than that like a guy jumping a friend or being completely disrespectful to your girl....just straight up trash talk and fists fly.
I haven't myself but did rush towards a guy after a Bills fan was knocked out after the Houston playoff game. I thought this was the guy that sucker punched the Bills fan but it wasn't...the Bills fan GF told me he wasn't the guy. I didn't hold him to be a badass, just held him waiting for the cops because I didn't know how bad the Bills fan was laying unconscious on the ground.
Other than that, I just don't let the trash talk bother me.
I've probably seen about 3 fights in my life at the 15 Bills games I've been to.