Fake geek girls as concerns video games matters not to me. I am very interested, however, in the idea of 'fake Table Top RPG girls'.
Actually, scratch that, make it 'fake Table Top RPG people' in general. Do they exist?
I mean, the 'proving grounds' for something like that, to me, involves committing to a game that could be hours long, and require some degree of commitment mentally. And I guess I'd want proof, personally, because my group of players aggressively recruit, and we want to integrate new (but not novice) players to our games immediately, which requires playing. A faker would either have to ruin their own evening/night/early morning, or come clean very early on!
Why would I aggressively pursue such proof? Because I love playing with new people! D&D is so much fun with a mixed crowd, whether the rules aren't an impediment to the enjoyment of the game because we've all been playing for years, or there are new players learning the ropes to the game, it's the dedication and the drive I appreciate.
As to the topic at hand, I still see it as not a gender issue. Geeks and nerds establish pecking orders the same as other clicks/social groups, and people who don't 'measure up' to the 'alpha' geek will be looked down upon by said nerd.
And how do they measure this? Who can hit the ball the farthest? Who can run the fastest? Who can fly the planes the best? No. It's who knows the most about their favourite topic.
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Personally, that's why I don't get into long conversations with aggressive geek/nerds. Not that I think I know everything and am smug, but more that my ego doesn't need bruising from some obsessive person in an anonymous forum where the word 'polite' means nothing.