At any public gathering of geeks engaged in a competitive group endeavor (this theory was tested whilst playing Magic: the Gathering back in 2002 or so, but any CCG or wargame will do. I suspect this theory would apply to cosplay, but I have yet to see it in action), if you loudly ask the assemblage "So, which one here is The Choad?", a majority of participants will immediately point to one person.
That person is usually the youngest, but not always. Regardless, he is almost always the one who bought the best deck/army to make up for his really shitty tactics. They match his shitty interpersonal skills -- he spits when he gets excited, interrupts constantly, doesn't respect your personal space, is constantly touching your stuff without asking (usually with greasy fingers), doesn't bathe as often as he should, etc.
It's a tremendous accomplishment to un-choad a choad, but that requires a lot of time, a lot of effort, and a lot of patience. It's possible when they're young, but past a certain age, it's not happening. They're set in their ways.
You think I'm being exclusionary? Gunnies, I have two words for you: Leonard Embody.