From Merriam Webster:

ethnocentrism

noun

eth·​no·​cen·​trism ˌeth-nō-ˈsen-ˌtri-zəm

: the attitude that one's own group, ethnicity, or nationality is superior to others

The definition is broader than you claim it is. Ethnocentrism can be discriminatory based on race, ancestry, etc. but it need not be. One could even make the claim, with perfect utility, that multiculturalism is an ethnicity.