Collective Narcissism
Collective Narcissism is an excessively high opinion or even love for one's own ingroup such as a group or organization. This ingroup does not have to be based on culture, or ethnicity, simply a membership such as a religion, organization, club, high school clique, sorority/fraternity, socioeconomic group, etc.
This view, especially the use of socioeconomic grouping as a focus of narcissism, is a frequent source of humor in situation comedies, i.e. extremely wealthy people who refuse to have anything to do with average people.