Teenagers: Over dramatic, stereotypical segregation is schools, ie "jocks" and nerds. Ridiculous house parties with red cups (who makes those?) where both parents just happen to be out for the night and come home early. Loose girls, guys walking around the school with football jackets, no school uniform, people actually turning up to watch their schools sport games, wild spring breaks, all have cars and care more about their appearance than they care about their own mother.
Police Officiers: Spend more time eating donuts at a cafe than they do fighting crime, really do sit in there cars and wait for someone to speed by.
Anyone of religion: Have extreme dogmatic views, would never have an athiest leader, use faith as their primarly moral guidance.
American culture in general: Stupid television adverts, racially segregation, gangs, crime etc.