Dumb Erratic Laughing Insolent Asshole.

I'm just listening to a practice talk of a PhD student. A certain person regarding herself as SUPERSMART entered the room AFTER the practice talk was already finished and instantly joined the discussion of the slides, telling him all the time what he SHOULD HAVE SAID. Sometimes I'm really puzzled about this amount of arrogance, ignorance and incompetence. Or perhaps just I'm too stupid to comment on a talk which I didn't even hear?? ARGH.