I think its cool when people take in interest in foreign culture, but there is a point where some people just take it way too far and piss you off...for example, when people are into Japanese stuff, but then they start literally wanting to be a Japanese person, but not a real Japanese person, just what they think one would be like. For example, those people who are obsessed with anime and want to be an anime character or something. Or the ones who pretend to know the language when they don't. Those types of people would annoy the crap out of me, and I'm sorry if you know people like that.
I'm white (Russian), but I'm really into foreign languages, cultures, food (=p), and so on. However, I've never taken it to the obsessive level; unless of course you consider wanting to learn the language or vacation there to be obsessive.
Personally, I would be flattered if people were into Russian culture. If someone wanted to learn our language, or learn to cook our food, or was into our music and tv shows, I would help them expand their interests and learn even more. I wish more people were as receptive to having others be interested in their culture. Frankly, I'd just be flattered if someone here in the States had something favorable to say about Russia or Russians at all, as opposed to just calling us all "communist, KGB, alcoholics." (-_-")
You have no idea how luck you are that people have something positive to say about your culture and people, as opposed to being rude and negatively stereotyping you. Please be grateful about it instead of thinking everyone that's into Korean stuff is a weirdo.