I now live in Fort Lauderdale myself. I can agree with the comments stating that the Dolphins fans are harmless. Most don't really even care about football, it seems.
You'll be in good company when there, plenty of Bills fans.
If you are tailgating, of course bring your gear and go nuts, but if you are just going to the game and want to dodge the parking fee, I have a hack for you.
Park next door at the Calder Casino and walk over, free parking. Some people even halfway tailgate in the parking lot there (discretely), go inside and have clean restrooms, etc too.
If you need any recommendations while down here, feel free to reach out. Always glad to help.