Sorry, it's a failure of Western thought to assume that absolute morality is possible or even desirable.
People will treat different people differently. This is never going to change. You can ask for politeness, but that's about it.
You must allow for some degree of racial and ethnic self-interest and misunderstanding, or people start feeling like they have no group agency. The power to discriminate as a group against another group is part of being a group.
Forcing people to empathize with each other is precisely why multiculturalism works poorly in the West. Westerners are just blind to it because they think good intentions backed up by moral outrage equal practical solutions. It doesn't.
The opinions expressed in this letter to the editor are the writer's own and do not necessarily reflect the policies of The Japan Times.