My downvote is not because of our collective sense of humor, but because I deny the notion of millions of people sharing a certain collective sense of humor.
> You don't think there's any such thing as nerd culture?
Nothing is ever black or white. I'm most certainly a nerd, but that doesn't mean I have the same sense of humor as every other nerd. Think of it like inheritance vs composition. Just because I'm a nerd, doesn't mean I inherit everything other nerds have. I only have some components. And while I appreciate Sci-Fi movies, I don't participate in wars between Star Wars and Star Trek (I think Stargate SG1 was better anyway).