Just be respectful. I have been the one sitting on the wrong side, and been the one next to that guy. In an SEC game, it is okay to consort with the enemy. Not so sure if it were FSU.
Right--especially the FSU part: questionable if they'd even want to BE there with you, no matter what the circumstance...just how it is.
I know that when one DOES go into an away game against certain teams, you do it with a buddy (or three)--and at least TRY to arrange tickets in the Gator section ahead of time, if possible, and even then, depending on the opponent, y'all have to be "aware".
The worst though was Miami in the old Orange Bowl. Won't go into it here (I've talked before about being at the notorious game in (I think) '81, the one that was "the final straw" as far as the UF Regents were concerned, when all the reports from fans and boosters poured in afterwards, and they basically cancelled the longtime annual game, effective at the end of the then current contract--THAT'S why we've seldom played 'em since), but that was bad--as in fight-your-way-out-of-the-stadium, find-your-tires-slashed bad.
The Swamp ain't ANYTHING like that--it'll be "loud'n'proud", but as long as your friend is good natured, everything should be fine most of the way. Mind my warning about if we ARE behind regarding beer and the 4th qrtr., though--just in case.