I live in Miami and the gameday experience down here as an opposing fan is not as bad as people make it out to be, there are definitely some a-holes but if you take the friendly approach to banter (as opposed to getting in their face) most of them will back off.
If you want to avoid confrontation either get there real early or real late and avoid the bottlenecks at the gate since that's the place were I've seen most incidents in the past. Also sit in the lower bowl, the extra $ is worth it considering the fans there are way more civil than the neanderthals roaming the nosebleeds, believe me you don't want to experience "gameday banter" from Dade county's finest truck drivers and forklift operators, such characters are way more common upstairs.