Pretend you like these: TV shows: Babylon V, Star Trek, Carnivale. When you meet a B5 fan, claim ST. Claim B5 to ST fans. Meet a fan of both, ask if they've seen Carnivale. No, Carnivale isn't true geek fare, but it's high-brow enough that you'll pass as one who has "burnt out" on the science fiction genre temporarily. Gain extra points by dropping "Buffy the Vampire Slayer" or "X-Files" into the conversation. Avoid "Sliders" and "Quantum Leap", they died on cancellation. Don't even claim affection for "Firefly", because Firefly is so supercool, even it's fans disown it for fear of being flamed by the other fans. It's like the name of a diety: never say it out loud.
Clearly, nerds are still in.