Do good looks mean a person is more inclined to be a jerk?

No, not in my experience. I have met jerks both pretty and ugly so it seems that the upbringing of the person and the attitude of the parents, etc. has much more to do with the person's attitude than outward appearance. And no, Jack, I don't think you are a jerk! If you were, you wouldn't be sensitive enough to ask such a question!