On one hand, it happens from time to time. Geek stuff has become, "Cool", and some people exaggerate there affinity for the various genres purely for a perceived social status, or, much worse, in an attempt to gain popularity by being a, "Big fish in a small pond", e.g., attractive girl who doesn't want to compete with really popular girl, and wants to attract geeks she feels she can manipulate more easily. In this realm of "posers", guys are just as bad as girls. Girls are less prone towards geeky media, however, so guys tend to exaggerate there affinity with a RELATED piece of media (I love science fiction...oh, and math...uhh...yeah, I totally love math. All those...numbers...), while more girls fake an affinity for something where they have no other geeky media to fall back on. Hypothetically, both reflect just as poorly on the individual, but faking an interest entirely is more grating to some.
On the other, more important hand, this sort of thing is WAY more rare then people want to admit. Geek-dom is, deep to its core, an inclusive subculture. It is a group that accepts you, warts and all, if you have a passion for any of those things that exist in a phase space outside of conventional reality. It is a culture to be proud of, but it is the opposite of exclusive. It is fundamentally inclusive. Noob at Call of Duty? Awesome, more people to play with, and I have a better K/D ratio while you are honing your skills. Just started playing Zelda last year? Hey, I envy your ability to see the series with fresh eyes. Passionate about a comic that you have just read 5 issues of? You know what, maybe you see the comic from a perspective I havn't considered because these characters have become so set in stone in my head over time. Is part of the motivation for joining this culture the attention? SO WHAT? How many male geeks have used there hobbies to start and continue their own friendships with people that maybe they would have otherwise been awkward around? So a girl has never done something geeky before, but wants to try, and wants to use that pasttime to socialize with people like me. AWESOME! The opportunity to share something I love with a girl who is interested in my nerdy interests sounds like my idea of an awesome Saturday night. Wheres the problem?
Also, I can't insult that girl in the meme. Shes kinda adorable.