I totally agree. Grr, argh. It unfortunately perpetuated that "fake geek girl" meme. Additionally, none of the "real" nerds are women, the inclusion of which could maybe help me give it credit for the broader sentiment you mention.
The Mary Sue had a great post on what's behind this and why it does matter:
"Some of us grew up hiding our geek identity for one reason or another. Maybe we felt insecure; maybe we got bullied for being “out.” Some of us hid or masked our identities as geeks well until adulthood. For many of us, when we see individuals who appear to have recently joined the community we feel uncomfortable with their different identity development. We had to suffer the bullying! But now that it’s “cool” to be geek, here they come in droves! God, they even look happy. Let’s stop that. That’s a whole lot of projection on people we don’t know. And they don’t deserve it."
I'm a big fan of inclusive geeky culture. I wish Portlandia had shown some of its more sophisticated biting wit with a broader understanding of the phenomenon.