It was at my school. Our jocks and nerds were very intermixed and hung out together in different groups, and our cheerleaders were mostly losers. The "popular" girls didn't really do any sports or activities to speak of, except for some resume-padding stuff like Key Club.

At other schools, I honestly think the stereotypes in movies became self-fulfilling prophecies. The terminology came from movies, and perhaps some of the division did as well.