I'll give my take on it at least.
I'm not afraid of people getting into my shit. I actually actively try to get people interested in my shit. My fantasies, the comics and books I like, the anime that I still like now that my demented otaku phase from high school is over. I enjoy introducing people to the stuff I like because I feel the stuff I like deserves to be liked and enjoyed by people.
The thing I hate is when stuff I like becomes a fad and people are into it because it's the "in thing" to be, and not for it's merits. This encourages garbage to be made in imitation of the stuff I like, but it ultimately shows how little it understands what's good about the stuff I like. I remember when the anime fad took over. Lots of people were going on about how into anime they were, but all they talked about was shit like Naruto, or stuff of similar quality. But you ask them about Mamoru Oshii or Hayao Miyazaki, or the people who have earned their places as the best in the industry and they know nothing about any of that, because they aren't really interested in anime, they just want to appear like they do because it's popular. It's all purely superficial.
Surely, you, Bob, understand that. I mean, look at what Hollywood trying to mainstreamize geek culture did to Star Trek.
But I take some comfort in knowing that fads come and go. Sooner or later, the vapid, identity-free populous will find something else they want to imitate. The poseurs will go away sooner or later, because they always do. BUT! Some people will stay, because, while they may have initially gotten into it for superficial reasons, some of them will find that they genuinely like the stuff and that's a net positive. Provided, of course, we don't frighten them off.
So, even though I find fake geeks (men and women, let's not kid ourselves by pretending that only the girls fake it) annoying, why are we not trying to bring them into our group? Nothing will scare the fakes away faster than us trying to get them interested in something that they'll quickly find they're not really interested in and, as a result of our trying, we'll bring new blood into the fold who may, as initial outsiders, have new ideas to lay on the table. That's a good thing, is it not?