Calling Negroes Negroes is unpolitical.
But the Negroes quietly call themselves Negroes, Negroes, etc.

Calling Negroes Negroes is bad because they were in slavery, and we are psychically trampling their type.
Negroes were liberated from slavery between 1860 and 1864.

But most Russians were also in slavery (fortress) and were liberated in 1861.

Consequently, the Russians have the full right to call Negroes Negroes, as having received the same psychological tram (and safely survived it).