I think plenty of people who call people elitist fall into one of the four categories:
1) Originally learned incorrect fact from website(Allakazahm

), after fact is proven wrong they stubbornly refuse to change. Over time this develops into thinking one way and refusing to believe any other way is correct or un-elitist. Basically turning into what they apparently despise. (Example: Bloodtanking)
2) Much like above, gets proven wrong and falls back on the "you are an elitist" to safe-face. (Example: Some random item debate involve Attack vs Haste or someting)
3) Roleplayer, occasionally wander into parks and attack people with homemade Clausturms. Category can also include the type who only level jobs "based in that city"(PLD/NIN is wrong because PLD is a San d'Oria job and Ninja is about stealth). May or May not accuse you of hacking their account through windower.
4) People who are unsatisfactory, know it, and just don't care until someone comes into conflict with them. They aren't really mean on purpose, they just don't contain ability to swallow the complex and confusing system! Instead they are probably indulging in Myspace or chatting with that Mithra who is really shy and won't talk over vent or send pics. Occasionally make threads about admitting they are a furfag, particularly over Krystal the Star Fox character.
Mix 'em up for extra lulz.