Xenophobia is the fear or prejudice of strangers or foreigners. Learn about the signs, types, examples, and causes of xenophobia, and how it affects society and mental health. Xenophobia is the social construction of exclusion of outsiders based on a myriad of factors, including notions of nationalism, ethnocentrism, and fear of foreigners or noncitizens posing some ... Learn what xenophobia is, how it develops, and how to unlearn it. Explore the psychological theories, causes, effects, and solutions of this primal instinct that divides people into 'us' and 'them'. prejudice, adverse or hostile attitude toward a group or its individual members, generally without just grounds or before sufficient evidence. It is characterized by irrational, stereotyped beliefs.