I agree on the different kind of geek thing. My other half is definitely a computer geek, the kind of geek who plays Magic and the kind of geek who has written long screeds about all the ways LoTR is better in book form than in movie form.
However, he's barely seen Star Trek (he's seen the recent movies and bits of TOS) and isn't really into sci-fi (or fantasy other than LoTR) in general. He also doesn't seem to care about comics or anything like that (I'll send him webcomics and he only likes some of them). And he's not into anime or manga despite living in Japan.
Personally, I think of myself as more of a nerd than a geek since there's only one thing I dig into really deeply (astronomy), but I do it in a way that's different from the typical geeky way of doing it (e.g. memorizing all the Apollo astronauts, ever) and do my own thing (e.g. spectral analysis of dying stars). However, I have a broad variety of things that I find interesting and I enjoy learning a little bit about everything. I also dabble in a lot of hobbies and even when the hobbies themselves aren't necessarily nerdy (e.g. knitting) I make them nerdy (e.g. knitting a pi scarf).
So yeah, I'd get schooled if someone was all about a particular comic book that I haven't read, though I've probably read comics they haven't (since I recognize that superhero comics are just one genre of comic) and I'm terrible at episode number and titles for Star Trek episodes, but I can usually figure out the plot for the rest of the episode based on a small snippet about the plot (at least for TNG).
