I have a roomate who is very stuck up and snobby....of course she just happens to be sharing a bedroom with me. She came down here to party and thinks the whole "work" part is a joke. (She routinely works less than 20 hours a week, just enough to make rent with literally a few dollars left over every week.)
She signed up for the program when she was drunk one night and came down to shop and drink (her actual words). So, she's not so into "Disney" as she's into "I'm in Florida for five months and I can do whatever I want!" So don't think that just because someone is working for Disney that they love it and there will automatically be a common bond between you and whoever you encounter.
Dealing with it has it's moments, but for the most part I just pretend she isn't here. The situation with her has gotten quite unlivable at times, but I just plow through those and move on. If things get REALLY bad, there are people you can talk to and see if you can have the offending roomate moved or maybe move out yourself to completely nullify the situation. That is a last resort, but if you end up with someone who's really awful, it's much better to go through all the hassle of that then be stuck miserable for months.
It's easy to think of ways to enact revenge on a roomate, ect, but don't. Not only will it bring you down to their level, you could get into a lot of trouble (including termination) for it. Having someone to vent to helps release a lot of frustration. Talk to your other roomates, maybe they are having the same experiences as you are with the offending roomate. If you find out the roomate is using you for something (I.E. you have a car and they keep asking you for rides, ect) tell them NO. Don't feel obligated to spend time with them. Live your life, and most likely they will be VERY happy to live theirs. Be a good roomate, clean up after yourself, don't give them any reason to get upset.
Your time down here will fly by...don't let a nasty roomie ruin it for you. It's up to you to make your experience down here a good one or a bad one, and it's too much of a life investment to be miserable the whole time you're here.