I usually try to find out what passions the other person has. If somebody is passionate about something (no matter what), then they have experienced depth in that topic. I want that depth; it is the underlying treasure of this world. That's why I will steer the conversation in that direction. If somebody I talk to wants to have a shallow pretentious chat, we can safely depart after 3 minutes, him thinking: "ok, that's one of the weird ones, that doesn't believe in the value of a high society chat". I celebrate being different and open-minded and non-elitist (in the sense that I don't feel that I'm better than anybody else) and all my close friends do too.

You probably have a reason for liking those Japanese bands. They excite you somehow. Find out why. If you can articulate it, then people will be able to understand your passion.