Culture is a social extension of the tendency to identify with the familiar and reject the strange. Ethnocentrism is the judging of another culture solely by the standards and values of one’s own culture. However natural a proclivity, ethnocentrism is the source of prejudice against other cultures.
Unless we can see ourselves as others see us, we take for granted that our own cultural traits are natural and proper, and that traits that differ from ours are unnatural and somehow wrong. ~ William Kornblum
Conflicts between peoples typically begin as a clash of cultural values.