I disagree. When I was in college ~4 years ago there were diverse discussions in all my classes and students freely contributed what would be considered conservative mainstream opinions without retribution - and when well argued earned some support from their more liberal colleagues.
University means different things to different people. For many it means partying. For others it means the paper certificate you may then use to get a higher paying job. To me the heart of a university is the discussion sections where students pick and prod at their lectures and each other's ideas. Diversity initiatives did not, anecdotally, affect those for me personally.