In fairness to the protestors, it seems they just stood in a silent protest with signs/t-shirts, and didn't try to prevent him from speaking.
And a good many professors happily joined in or worse yet, incited them from the sidelines.
Teaching has become a self perpetuating industry which has rendered it largely worthless. Our colleges have too many students who don't belong there being taught social justice by too many professors who belong behind the counter at 7 eleven. Federal money creates fertile ground for this crap.
Gotta love Hillsdale college for refusing to give teaching degrees without a 4 year degree in something real like History, civics, literature etc.