Why do you think many people fear other ethnic groups with varying cultural backgrounds moving into their neighborhood?

The reason behind this is because people fear something different.  Some fear that if groups who have different cultures and beliefs would threaten their own.  It gets worse when they believe that these groups are going to ease them out of their homes.  Another reason could be racism.  Some people consider themselves superior to others.  They think they are better than other groups do not want to associate them. It can also be due to growing gap between rich and poor.  The rich often live in exclusive neighborhoods and do not to coexist with those who are not on the same economic level as them.