Self hate

According to Washington, D.C., clinical psychologist Dana Harron, the things people hate about others are the things that they fear within themselves. She suggests thinking about the targeted group or person as a movie screen onto which we project unwanted parts of the self. The idea is, “I'm not terrible; you are.” This phenomenon is known as projection, a term coined by Freud to describe our tendency to reject what we don’t like about ourselves. Psychologist Brad Reedy further describes projection as our need to be good, which causes us to project "badness" outward and attack it.