It's bad to think only in stereotypes.
Carl walks down the street and sees a group of young men, who appear to be of an ethnic minority, standing on the front porch of an apartment building.
Carl wants to know if this group of people will harass him as he passes them by.
Carl greets the young men from a distance, and they return his greeting in a casual way.
Carl eyes the group carefully to determine if they are an ethnic minority that he is afraid of, and crosses the street to avoid them.
Carl feels safe, and the young men feel good that they live in a friendly neighborhood.
The group of young men notice this behavior and feel that they have been unfairly treated with prejudice, and Carl feels guilty about what he knows are inappropriately racist views.