As a guy who has that same nerd/creepy look as Joe Lauzon, I can say its his face. People look at your face, and just want to punch you in it. The guy probably thought he could legitimately submit Joe Lauzon easily after winning his white belt amateur tournaments.
If you didn't know who Joe Lauzon is, you wouldn't really think that he is a guy who can snap your limbs and choke you out repeatedly in under 3 minutes. Its like all the people who genuinely hate featherweights and bantamweight and flyweights. They hate them because average joe couch-potato thinks he could destroy them, and they dont deserve the recognition they get.