I have found the UM fans to be much more stand-offish. I've witnessed equal amounts of meanness for UF, FSU, UCF, USF...well, anyone who wasn't UM.
I was raised a Gator. Dad graduated from there in '59 with a degree in Metallurgical Engineering. (Mom is a Bulldog and we lived in Jacksonville at one point. They went to the game every year and still managed to stay together) The first sentence my dad taught me was "Bulldogs are Gator-bait."
My half-brother graduated from UF in '92 with a degree in Electrical Engineering. My half-sister graduated from FSU around '87 with a degree in Nursing. When I got accepted into FSU Theatre for my Master's and told my dad, he told me he had never been happier to have a 'Nole in the family.