He even took the time out to personally acknowledge a couple of other Miami fans. If you'd like to see the salute he gave, just click here. Link name might be a further give away of what you're going to see (it's censored on that site though!)
Now I know many people would call it tasteless and classless. And in some aspects it is. But he's at an MMA event. And it was on Showtime, so he's helping give the people what they paid large amounts of money for...entertainment. Also, would you really expect anything else out of Rex at this point? It's just what he does.