Answer:
ETHNOCENTRISM
Explanation: Ethnocentrism is a term in sociology used to describe the act of judging the culture or beliefs of others using a person's own as the standard or yardstick. Ethnocentric individuals always belief in the superiority of their own culture making them to look down on other peoples culture and belief. Ethnocentrism is the major cause of divisions among people in a society
like the quote from William Summer which says ''one's own group is the center of everything,and all others are scaled and rated with reference to it'' is an Ethnocentric statement.