A large crowd of students walked out of the Notre Dame commencement ceremony on Sunday in protest of the speaker, Vice President Mike Pence, who delivered a speech that mixed platitudes about bright, dream-filled futures with a lengthy rebuke of political correctness on college campuses.

As several dozen students in caps and gowns quietly exited the graduation ceremony, the vice president praised Notre Dame, one of the nation’s most prominent Catholic universities, as “a vanguard of freedom of expression and the free exchange of ideas.” Other schools do not measure up, he said.

“While this institution has maintained an atmosphere of civility and open debate, far too many campuses across America have become characterized by speech codes, safe zones, tone policing, administration-sanctioned political correctness — all of which amounts to nothing less than suppression of the freedom of speech,” he said. “These all-too-common practices are destructive of learning and the pursuit of knowledge, and they are wholly outside the America tradition.”