The tendency to see members of out-groups as very similar to each other is called:

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The out-group homogeneity effect refers to the tendency to perceive members of out-groups as more similar to each other than they actually are. This can lead to stereotyping and prejudice towards out-group members. Ethnocentrism refers to the belief that one's own cultural group is superior to others, the bystander effect is the phenomenon where individuals are less likely to help in an emergency situation when others are present, and the self-serving bias is the tendency to attribute one's successes to internal factors and failures to external factors. None of these concepts directly relate to the tendency to see members of out-groups as similar to each other.

The Tendency to See Members of Out-Groups as Very Similar