Xenophobia

I learned a new word today.

It means... a dislike and/or fear of that which is unknown or different from oneself. It comes from the Greek words ξένος (xenos), meaning "stranger," "foreigner" and φόβος (phobos), meaning "fear." The term is typically used to describe a fear or dislike of foreigners or of people significantly different from oneself, usually in the context of visibly differentiated minorities.

This is straight from the good ole Wikipedia.