In my observations sports brings out the worst in people. Maybe its just where I live but I have had:
-A guy scream in my face in a bar because I "disrespected the Steelers" by not watching a football game.
-A boss who gave me a write up for not wearing a jersey (that costs $130!) to work during the superbowl. (HR later got rid of it thankfully).
-Friends/Family/Coworkers who act all pissy if their team loses.
-Friends who make plans, then cancel because some silly game is on.
-A college 20 minutes from me (Penn State) riot because a coach got fired.
-I see news articles like the one above, or the poor person that was beat and is in a coma, or see all kinds of videos of soccer riots.
Its a game, and people let it control them for some reason. I don't understand it they aren't even playing in the game.
I understand not everyone is like this, but in my area where I live, almost everyone is like this and its sad.