I think she didn't look hard enough. The variety here is incredible, perhaps because Duke is selective in that way. The admissions committee is looking for people who don't blend into the woodwork. But there are ways to classify people here, and finding a place within that hierarchy can be a challenging experience. There are obviously some of the same divisions here that are found in high school.
Jocks are jocks, whatever that means.
Not that the exact stereotype applies here - everyone is pretty intelligent, and the main reason that sports guys stick together is because they spend so much time with each other to begin with in practice. I went to Rush previews today, and I will admit, a lot of those girls looked like the same people. But they were animated, interesting, friendly girls, and I really liked the ones I met. They seemed pretty genuine to me. So what looks shallow to some may not be that way in reality.