Yes, they can be obnoxious, but they can also be a whole lot of fun. You really have to just let the taunting roll off you like water off a duck's back. Give 'em a "Roll Tide," tell 'em how much you're looking forward to the game, and the more knowledgeable ones will give you some really good conversation. If they don't, then you know you've run into the more ignorant ones (which every fan base has), and you can be on your way.
Mostly, just have fun. If you focus on what they're doing rather than what you're trying to do, then you lose.