Self-righteousness: confident of one's own righteousness, esp. when smugly moralistic and intolerant of the opinions and behavior of others.
I have been accused of being self-righteous on several occasions. To reinforce it, let me say that I never understood why it was a bad thing. :) Finally H broke it down to me superbly. That there is no point in arguing for " the right thing" because a) it is extremely relative and b) we don't live in an ideal world. So in doing so, and doing it vehemently, aggressively, I only end up looking smug and arrogant. You'd think I'd have figured it out by now, but perhaps my thick head was in the way. :p