I think English speakers just have a tendency to water down just about everything (and I have a tendency to generalize a lot, heh). If you know how to install a program on your computer you're a 'nerd' and if you're feeling a wee bit down you're 'depressed'. I wonder if there's any other language in the world where people make this light of legit depression. I bet it's also what fuels the 'who cares if you're depressed, pull your shit together' mentality.
What >>25986 said more or less. Depends where you live really but it's a bit of a thing in Western Europe nowadays. The thing you need to keep in mind is that it has to be done in moderation. Being vaguely familiar with some video games and comics might be 'cool' but once you cross some obsessiveness barrier you'll get back to getting the same treatment nerds got ~20 years ago.
In a way I miss those times, though. Nowadays the mainstream 'nerd' culture isn't really about being a nerd becoming an acceptable thing or anything like that, it's about special snowflake normies warping it in a way they see fit (which pretty much means 'ruining it').