Personal prejudices make us lump people into categories. Sex, race, age, gender, class, nationality, weight, political choice, religion—the list of prejudices we can feel is endless. Most of these things  have little or nothing to do with choice. Even one’s politics and religion, or lack thereof, may effectively be chosen for us by community pressure. 

When people actively prevent the object of their prejudice from participation in anything, prejudice becomes discrimination. Our country’s political and…