I find this an interesting, unattractive, and unfortunately fairly common trait (and one I’ve, of course, even observed in myself). When people feel lousy inside, I have often seen them pick fights with others (or simply complain about other things) to be able to direct their frustrations somewhere outside of themselves. My guess is it’s a coping mechanism, to either not blame oneself, or when one is unable to identify the precise issue and erroneously finds outside problems as the only thing they CAN identify and therefore blames them.

Achht. But who knows. Maybe we’re all just cranky bastards. :)