No nation is post-racial, ever.
We all like being what we are, which includes language, values, customs, heritage (including race) and national identity.
This topic, however, is taboo — and we should ask why, seeing how large corporations, hippies, anarchists, media overlords and oligarchs all agree it should be taboo.
We can't discuss it because it violates our fundamental belief that all individuals are equal. Yet why do we have this belief? To pander to each other and to sell each other stuff.