I get angry when people disagree with me on topics of discussion. I do research on subjects, gather facts and statistics, and objectively listen to both sides of the debate to obtain a well informed perception of the subject. Then, if it comes up in conversation, I present what I know, and someone says what they know, but if I agree with some points of their opinion they act like my points aren't even worthy of consideration. I walk away angry, because it feels like they invalidate my knowledge. that's probably why I don't really have deep conversations about anything.