> you either call yourself russian or get marginalized. It's so pervasive that people stopped noticing it.

There is massive racism in Russian society, the various awareness movements that happened in the West never happened in Russia. One could compare the way USA has treated native people, and many issues would be similar.

Additionally, some of the ehnicities have beef with each-other that sometimes sparks into armed conflict.

https://en.wikipedia.org/wiki/East_Prigorodny_conflict