I've only been at this game a few days, and so far, I've only run into nice folks. I was in a fight with some random monster, and in the middle of it, some passerby decide to help me out by casting some kind of Stoneskin spell on me, and another guy in Ul'dah just up and gave me some body armor that was better than what my PC was wearing.
Nice.
I suppose at some point I will run into a jerk or two, it seems inevitable as it has happened before in my somewhat limited experience with MMOs. I'll deal with it like I did the others - ignore or report (depending on how bad they were.)