The idea is: students saying "I don't want to hear this" shouldn't affect research. Although the students should have a right not to hear what they don't want to hear. And the university should have a right to choose how much of this "not hearing" is acceptable with getting a diploma there; again, each university should be freee to chose differently.

I would put it much more simply: students have a right to refuse to attend lecture, and professors have a right to give students a failing grade for doing so. And employers and grad-schools have a right to filter for students who actually learned something at school.

Thus, everything adds up to normality.