"Calvinism is a way of thinking. It's a worldview. It's a doctrinal system. It demands thought and intellectual rigor. It must be learned. It is a minority position in America and in the American church. None of this make the Calvinist a nasty person. But if you have a predilection toward nastiness, then developing an intellectually sophisticated set of beliefs that you understand and most people do not will help you immensely in your feelings of superiority and expressions of condescension."
Whether or not traditional Calvinism makes people jerks or not is not for me to say. Anyone pushing a complicated set of doctrines thinking that what they have is the truth and what all others have is a lie even if all those others profess Jesus, well it makes me very wary.
As Paul point out in his New Calvinism For Dummies pt 6, when major leaders like Tim Challies claim that what New Calvinist have it wheat while all others have chaff, well, that's pretty arrogant. It is easy to see why some New Calvinists fall into elitism which flows nicely into Phariseeism. I'm not saying that is happening to all New Calvinist. But I am saying that I've seen some really jerky, Pharisaical New Calvinists roaming the blogsphere. Just saying.