Definitely an Assclown! I can't stand it when fans act like that at a game. Obviously saying some stuff is fine but whatever this guy said must have been way over the line.
The player should never have even thought about throwing the chair unless he felt his life was threatened and I doubt if that was the case. They should have called security to get the guy thrown out. Players and coaches can also tell the umps to get involved and they will get security to toss the fan.
I hate when fans act like that and I am extremely embarassed when I'm at a Bills game and its our own fans doing that. I'd like to think that Buffalo fans have better class than that, but they don't. These few idiots are the ones that give sports fans a bad name. People like this shouldn't be at a baseball, football, or hockey game, they should be at a soccer game in Europe where the rest of the hooligans are.