You will encounter someone today who seems like a text book example of a jerk: but try to be open-minded about them! Judging a book by its cover has never been your style, so why start now? Extenuating circumstances are at work here. Maybe they're intimidated by you. Maybe they're acting out because they are nervous or just have a headache! You just don't know enough to know who they are. Give them a chance and give them time.