Agreed. The alcohol (which I proudly consume) is the issue. I however don't utter a single swear word, don't harass anyone, don't act like a moron, etc. Not sure what the trigger is to drink and be a douche.
At the GB game, we had a really, really hammered person behind us. After one quarter of his horrific language we turned around and said next swear word out of your mouth, we're using the phone number to report him. He was quiet the rest of the day.
I know Cincinnati has that number (the Jerk line it's called) and it really curtailed rude behavior towards me at the 2011 loss in Week 4.