Answer:
Ethnocentrism
Explanation:
Ethnocentrism is the tendency to evaluate other groups according to the values and standards of one's own ethnic group, especially with the conviction that one's own ethnic group is superior to the other groups. That member of the group is being Ethnocentric by judging the food that's eaten in a foreign land he was in as horrifying just because they don't eat such from where he came from.