The mere fact that it was done purely for a 'piss take' is the problem. If it were simply about the game then that'd be fine...but much like the 'fans' that went to the game, it obviously wasn't about trying to follow the team, but merely some point scoring in the "we're da best fanz eva"...
It's the bully mentality in them. More than likely making up for the fact that they've got some deeper emotional trauma therefore need to counteract it by trying to feel superior at all times. We should probably offer them support and advice.
How do you know if you weren't there? Or is it a case that you were there and thought being a billy big bollocks would somehow make you look like a well rounded human?