As a former graduate student I didn’t realize that there were stereotypes. Besides I never had time to worry about it and rarely saw students who weren’t in my own small corner of the world. I basically lived in the biology building, the basement of the museum, and home, and that was it. But then I also was obsessed with my subject and spent all my time researching it or out in the field. I rarely got to know any other students except those equally obsessed.
Well, we did tend to tease the guy who studied fossil mouse teeth, but he took it in good spirits.
However, as an undergraduate I kept running into similar personalities within various majors.
As a biology major I had my notes stolen by a pre-med student and I also had an experiment sabotaged by a pre-med student. The ones I knew were extremely competitive and obsessed by grades, some to such an extent that they would damage other students’ learning.
However, biology majors who wanted to go into biology itself tended to be rather laid back, capable of making really wild punch in trash cans, and often obsessed with one particular type of animal, such as monitor lizards or tree snails (the last was me).
Philosophy and math majors were interesting because they were very good at getting so distracted by a thought that they would forget to go to class, or even to eat at times.
Business students were completely uninterested in us slovenly natural history types and were always discussing where best to apply for a job. They also wore nicer clothes than we did.
And many law students were obsessed with appearances, except for one guy I knew who let his hair grow long and always wore tattered blue jeans. He was later hired by a fancy law firm because they needed a lawyer whose appearance would make rock star clients more comfortable.
I knew a number of engineering majors and almost all of them were quite angry that they had to take silly stuff like English, history and so on. They wanted to do engineering and couldn’t see why they needed to know anything outside of engineering.
That’s my experience and I’m sticking to it.