The Japanese are probably the most racist people on the face of the earth. The Koreans aren't much better.
The biggest problem with the Japanese, in my estimation, is their outright refusal to come to terms, or even admit, to the atrocities that they perpetrated against native people in Asia during their colonial/empire building period from the late 1800s through 1945.
Nanking? The Chinese did that to themselves!
Unit 731? They were trying to CURE an outbreak of plague, typhoid, etc.!
Most Japanese don't even know about the issues surrounding 731 or Nanking, or any of the other well documented atrocities committed in the name of the Emperor.
Ask them about the atomic bomb, though...