There's some truth to this, I think. It happens.
I went to the Superbowl in 04...Houston was half-Pats/half-Panthers. Great atmosphere.
In 05, Eagles' fans greatly outnumbered us. If you crossed the river into downtown Jacksonville wearing pats gear, you were taking your life into your hands.
Going into the stadium, all you could hear was "Soar, Eagle, Soar," or whatever that stupid song they sing is called.
My friends at the game told me it was the reverse of 01, where Pats fans dominated Rams fans (who had been at the Superbowl the year before).