Y'know, I do actually have a contribution on this, and that is Fake Nerds both exist and most importantly are not just girls.
As just about anyone who's spent time working in a comic shop is aware you get a whole plethora of non-fans who stop by to buy things, ranging from the speculators (people who buy comicbooks just because they assume the market still works like it did in the 1970's and they'll be WORTH something in the future, ignoring the fact the only people it'll be worth money to is people exactly like them) to the fakers, and the fakers are apparently now important enough the rest of the geek world is dealing with it.
Ever since the Dark Knight I have to had to deal with idiots telling me how cool Batman is, how the Joker is awesome and how Heath Ledger's version is the best that'll ever be achieved. And I don't mind that they're big on the movie, it's just when this extends into pretending to read the comics. People will buy one batman issue, half read it, decide it's more fun to just claim to love batman/wiki it and spend their days claiming to be a huge fan. Understandably, I find this aggravating when I get told how lame Robin is solely because of a skit on Family Guy or because Christopher Nolan didn't use him (wisely, it wouldn't have fit the tone of the movie but there is a POINT to the character so *rant ramble, WWII and daddy issues, boring and irrelevant*) Aquaman's worse, the cow-eyed shit-spewers on Big Bang Theory say how "no-one likes aquaman" and suddenly he's not cool any more. I get that its cool to rag on him (despite his prowess at throwing polar bears [http://i671.photobucket.com/albums/vv73/scarey_01/01-Polar-Bear-Toss-Aquaman.jpg])
But this problem is one that I've just started ignoring. You know if someone's not really interested and only doing it for the attention and you ignore them and eventually they'll move on, you might overhear them saying how 'amazing' the N64's graphics while wondering what resolution they are and then you'll probably need to smack your head on a table for a few minutes.
Point is (and this is decidedly unhelpful since it's a rant aimed at stopping exactly what the rant itself is doing) if we stop talking about and stop paying attention the problem will go away, or at least we won't need to deal with it. Though as a serious note, it does piss me off that it's always 'Fake Nerd Girls', gender doesn't come into it, you get posers on both sides why do all these articles have to mention that it's a problem with "Fake Nerd girls" not fake nerds in general? + Cosplay is really just a thing people do, it's not neccessarily exhibitionism even if the costume is scanty (Saw a dude cosplaying as Namor, didn't assume he was doing it to show off he was an aspiring Micheal Phelps)