Belief in the superiority of one's own ethnic group WordNet 3.0 & Open English WordNet

Ethnocentrism in social science and anthropology—as well as in colloquial English discourse—means to apply one's own culture or ethnicity as a frame of reference to judge other cultures, practices, behaviors, beliefs, and people, instead of using the standards of the particular culture involved. Wikipedia

judging other cultures, practices, behaviors, beliefs, and people solely by the values, standards and frame of reference of one's own Wikidata

The tendency to look at the world primarily from the perspective of one's own traditional, deferred, or adoptive ethnic culture. Wiktionary

Tendency. Wiktionary (translation)