Cognitive prejudice is a phenomenon that people often distort their perception results due to their own reasons or situations when they perceive themselves, others or the external environment.

For example, people often think that the police are unsmiling; Girls can't do math and physics; Judges always have curly hair; Teachers wear glasses and so on.

Cognitive prejudice tells us that we should treat problems objectively and fairly, treat specific problems concretely, and never make subjective assumptions, thus affecting the next decision on things.