Why are minority groups often prejudiced towards other minority groups?

Today at work I heard a black coworker openly state twice her prejudice against Jews. Likewise, growing up with Jewish ancestry I have heard many Jews state their prejudice about Arabs, and I've seen Arabs state prejudices with other groups, and those groups stating their prejudices with about other groups, and... show more Today at work I heard a black coworker openly state twice her prejudice against Jews. Likewise, growing up with Jewish ancestry I have heard many Jews state their prejudice about Arabs, and I've seen Arabs state prejudices with other groups, and those groups stating their prejudices with about other groups, and so on and so on and thus continues the cycle.

All of these groups have faced (and perhaps still face) extreme prejudice. How are we going to discourage prejudice when the people suffering from it are also the ones showing it?
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