Rule #1. Have a Narrow Point of View
Never consider or try to understand things through viewpoints other than your own. Of course your point of view is the only one worth considering. It's the right one!
Rule #2. Be very emotional.
The more emotion, the better, anger is best. After all, is good to be passionate, so the more anger, the better, this leaves out other pesky ways of thinking, like rationality, and logic, who needs those? Make sure you get offended easily.
Rule #3. Never Change your mind.
Never, ever, under any circumstances even entertain the idea that you might be wrong. That's what weak people do, absolute certainty is the way to go. There is no way others could be right, and you could be wrong.