According to Metapedia:
Racism is a term usually only used by critics. Official definitions of racism often state that the term should only be applied on the belief that some races are superior and on negative actions due to this. In practice it is often applied as a form of ad hominem on anyone believing in the existence of races or even on persons advocating restricting immigration, persons criticizing another culture or multiculturalism, persons supporting their own country/ethnicity, etc.
Nevertheless, “racism” could be a term mostly used not by our enemies but by us! Had values not been inverted by Christianity and its bastard son, liberalism, racist attitudes would be considered a great virtue, as Nietzsche saw:
Christianity, sprung from Jewish roots and comprehensible only as a growth on this soil, represents the counter-movement to any morality of breeding, of race, privilege: it is the anti-Aryan religion par excellence. Christianity—the revaluation of all Aryan values, the victory of chandala values, the gospel preached to the poor and base, the general revolt of all the downtrodden, the wretched, the failures, the less favored, against “race”: the undying chandala hatred is disguised as a religion of love.