they are condescending, arrogant, and pretend that their small ideology is always right and that everyone else is always wrong. Even if they agree with someone they may claim "you are not liberal/conservative enough"! If any Libertarian ever managed to get in a conversation with me on the street while coming off as a self-righteous prick they better pray not to piss me off.
Yeah 'cause those people with other political ideologies are SO freaking open minded it's scary. They never ever think they are right and others are wrong.