Japan and South Korea are OK. I actually had a chance to get with a South Korean exchange student, a cute one, but I blew it with my "graah teenage rebellion i'm not going to church because i'm a rebel" crap. As long as Japan and South Korea keep cranking out my technology, and Japan in particular keeps making my video games, I've got no problem.
China is a growing problem just waiting to come out though, and North Korea is run by a batshit insane midget. I don't exactly trust either of them, but that's more a "government/political" thing than a "racial/ethnic" thing.
As far as those of East Asian descent who are living in the Western world? I don't really have a problem, they don't get in my way so I'm not about to start anything. Heck, one of my best friends in high school was half Korean.