What do we call the belief that one’s own culture or way of life is normal and natural and the practices of other people are abnormal and unnatural?

Ethnocentrism

Explanation:Ethnocentrism is defined as how one regard their own culture as superio and uses that to misjudge and defines other people's culture.The standard of your own culture is used as the basis of measuring other people's culture and whatever doesn't align with your culture is regarded as abnormal and unnatural because a person believe what is normal and natural is only that which is found in their own culture.This lead to biases and in looking at other cultures as being inferior.