My thoughts, in no particular order:
1. I hate geek girls who need to emphasize how attractive they are in geek environments (in business environments, it is sadly a necessity, but in the lab, my hair is a mess, I'm in a sweatshirt and jeans, and if you question my cred, I WILL get you thrown out). We get it, you're a girl and you like geeky things. If you're not willing to get your hands dirty, though, I have no use for you.
It goes back to an episode of House. He was interviewing a guy with long hair and tattoos for a fellowship. Long-hair says "I like you because you don't care what anyone else thinks". House replies by saying "Yes, but YOU do. Find the Asian kid in the library with his head in a book. THAT guy doesn't care what anyone else thinks."
Thus my problem (admittedly a snobbery on my own part) with "geek girls". They KNOW they can get promoted quickly in this environment, so they play it up, then when they get promoted, they can't hack it because they were just focused on getting attention first.
(By the way, I come down by an extremely small margin on the side of Ryan Perez in the Perez/Day debate. Wave Day's "geek cred" at me all day long, you'll never convince me that if day looked like Mayim Biyalik, she'd have gotten as far, nor that if The Guild was written by guy, it wouldn't be considered sexist. Perez was a douchebag, yes; but he wasn't hating on all women, and Day is surely not beyond reproach. And don't even get me started on Wil Wheaton's reaction to the business. Relevance? The business swings the other way in the form of "white knighting", which is just as bad.)
2. As a nerd, I suffer from my own brand of snobbery. Admittedly, that's wrong, but I'm tired of people who call themselves nerds because they call themselves fans of Star Wars, Star Trek, Firefly, but can't tell me anything about Stephen Baxter, Neal Stephenson, Carl Sagan, Isaac Asimov, or even Stephen Hawking. I like Star Trek, I don't even have THAT big a hate-on for Episodes 1-3 (If you view them through the lens of "it was written as an oral tradition, it actually makes sense in a quirky sort of way"), I don't really like Firefly (which I've taken a lot of heat for, I'll tell you something). I just have a hate-on for people who like what it's "easy", "most accessible" or "in vogue" to like. Go read some Frank Herbert and stop shouting me down because I don't know in what book Chewbacca died, or in which episode the Enterprise crew were all high on the Lemon Wacky Hello. (Not that I actually SAY that to people, but I've been told "I'm not a nerd" for saying that Firefly is not nearly as good as Lexx.)
3. As someone who follows an alternative religion, I've also received flack for the "holier than thou art" brigade. I don't really like bringing it up, because I don't really like talking about it, but okay. I'm a neo-pagan, tending towards the agnostic. Yes, there are some of us that aren't running around wearing 5" pentacles and threatening to curse you, because that's the equivalent of the evangelical yelling "I'll pray for you!". But from within my own "tribe" I've been quizzed: "You mean you don't know what Dragon's Blood does? Or how you use tanzanite?" No, I don't. I don't feel like I need to cast "spells" (don't get me started on that stuff) to take the influence of female role models within the community to make me a better person.
Point? I've been on the OTHER side of the debate, too. So I try to be on the side of moderation. Ignore the poseurs, but avoid the "geekier than thou art" brigade, when you can.