Why do so many people dislike discussing class material outside of class?

Hey everyone, I'm a bachelor student of international relations and whenever we learn a new theory or discuss a reading in class, i'm always eager to discuss it with my classmates after class ends. However, a vast majority doesn't seem interested at all and act as if there's something wrong or weird with me for wanting to learn more about it than is absolutely necessary for the exam.

E.g. we had a class debate on the theories of Kuhn and Popper, with my group arguing for Kuhn's theory of knowledge. However, when i asked my group members about their own personal opinions / stance, they sounded very disinterested. (I know this is a special case but hopefully illustrates my point).

I'm sure a lot of students are just there to do the work and get a degree, but what surprises me is that in 3 years I've only met like 1 or 2 people who genuinely want to discuss the topics/material, even though my year group alone has around 600 students. Although many enjoy discussing geopolitics at parties or whatever, the discussions are nevertheless usually very casual and surface level. Like, yeah it is "work," but the work can be interesting nonetheless right? Studying might be a chore, but discussing the material without pressure doesn't sound as 'bad'.

I was wondering why this is the case, and if you guys might have experienced something similar/different. It feels very lonely sometimes. Eager to hear your thoughts!