Xenophobia

Xenophobia is defined as the "hatred or fear of foreigners or strangers or of their politics or culture". It comes from the Greek words ξένος (xenos), meaning "stranger," "foreigner" and φόβος (phobos), meaning "fear."

Xenophobia can manifest itself in many ways involving the relations and perceptions of an ingroup towards an outgroup, including a fear of losing identity, suspicion of its activities, aggression, and desire to eliminate its presence to secure a presumed purity. Xenophobia can also be exhibited in the form of an "uncritical exaltation of another culture" in which a culture is ascribed "an unreal, stereotyped and exotic quality".
Xenophobia can mean a fear of or aversion to, not only people from other countries, but other cultures, subcultures and subsets of belief systems; in short, anyone who meets any list of criteria about their origin, religion, personal beliefs, habits, language, orientations, or any other criteria. While some will state that the "target" group is a set of persons not accepted by the society, in reality only the phobic person need hold the belief that the target group is not (or should not be) accepted by society. While the phobic person is aware of the aversion (even hatred) of the target group, they may not identify it or accept it as a fear.