Would I say "you have some unresolved issues that are causing you to apply a blanket attitude to a whole race of people. Have you ever tried working through that?" to a black person?

Sure, the OP's race has very little to do with my comment. I didn't assume the OP's race at all. I might adjust my comment if OP were also Japanese, but I don't see how my comment was otherwise unable to be applied to all races.