Thanks guys - I knew that I wasn't overreacting, because I've seen people do that, and it's pretty funny to watch. The main problem that I have is that people just don't care/are lazy, and don't want to be told that they're making a mistake. I deal with alot of people in my job (young and old), and by far, the most defiant and disrespectful are the 16-20 year olds with attitude problems.
I almost felt like walking right up to her and leaning on her - that's how I handle problems, and it offends most people (when I'm blatantly obvious in my actions).
Pedro - yeah, it was my car. Next time I may just park away from everyone else, so that I don't have to worry about having some cunt smart off to me.