When mean people hang out together and validate each other's meanness. This phenomenon has been studied as it relates to school bullying: Kids who bully tend to find kinship with other kids who bully.
My spouse's ex sure does engage in a lot of gooncest with his nastyfriends.
The discrimination of another group of people based solely on the fact that they goon, with the belief that one person who doesnt goon is superior to the lather.