Come on, I may not be fan of some cocky Americans, but a confirmation from the accuser's companion (the pax) means fxxkxll and as what we all knew. This boils down to an Emirati's words against a foreigner and as far as I'm concerned, the case is inconclusive.
Also bear in mind that when it comes to size of ego, you won't find a bigger lot than the locals here. (And did the report mention an Immigration officer? Wrong day wrong time for the accused, surely)
Though wisdom prevails and if I may quote Turkeyslapper:
I guess its still a good reminder to politely smile and let them be on their crazy way!
Lastly, it's really quite cheap to install a high resolution in car video camera (go for the dual cam model for front and back), saves you lots of talking. I basically avoided a whole lot of argument when I pointed towards my camera right after an Emirati reversed into my car, problem solved instantly.