I was a really big nerd up until freshmen year of High School. I was the bad kind of nerd too... You know the
"Heh..heh..Video Games..heh..Dungeons and Dragons..heh.."
But my freshmen year I realized it and said to myself Screw This. And once you have been a nerd, and have gone back to being normal, you tend to hate nerds. Ex-Nerds, Former Geeks, No Longer The Guy On The CheerSquad, or whatever you want to call them, make fun of nerds much betetr than just jocks or normal people. It's because they know secrets of the true nature of nerds that can only come from first hand experience.

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Here's an example, George Lucas, the guy behind Star Wars. he has one of the biggest fan bases in the world, and for the purposes of this example *Cough...Cough*, lets say most of them are nerds. You know at one point or another he has wanted to mess with some of those nerds. And he really could, he could mess them up for life. Could you imagine George Lucas going to a Star Wars Convention, walk up to a pack of nerds, cause everyone knows that they only move in packs. Walk up, lean in, and just say something like
"Chewbaccas really a woman"...
"and Luke Skywalker is a hermaphrodite"...
And just walk away....