Actually, I have friends or family who have come across racial discrimination in Japan. For example, many private porno stores or places such as brothels do not let "gaijin" in because the owners do not want gaijin to "interact" with japanese women. Another time, my friend could not get a credit card because the credit card company said that gaijin are less reliable and they might "pack up and leave" any day.

Btw, personally, i think there is a difference betweem racism and racial disrimination in the sense that racism is a stronger feeling and it sometimes involves violence. Groups like the KKK and the Nazi's invlolved racism and exaples that i have given above are racial disrimination.