In high school I probably fell victim to a few of these (1, 2 and 4 sound awfully familiar) and I certainly have friends who did. I'm not sure this is a comprehensive list, or that these fallacies are really held by "geeks" in particular (as opposed to just immature people), but it's fairly insightful none the less.

GSF1 prevents its carrier from participating in -- or tolerating -- the exclusion of anyone from anything, be it a party, a comic book store, or a web forum, and no matter how obnoxious, offensive, or aromatic the prospective excludee may be.

As a result, nearly every geek social group of significant size has at least one member that 80% of the members hate, and the remaining 20% merely tolerate. If GSF1 exists in sufficient concentration -- and it usually does -- it is impossible to expel a person who actively detracts from every social event. GSF1 protocol permits you not to invite someone you don't like to a given event, but if someone spills the beans and our hypothetical Cat Piss Man invites himself, there is no recourse. You must put up with him, or you will be an Evil Ostracizer and might as well go out for the football team.

via Backwards City