Can you say more about what you've observed around "can't challenge your professors"? My professor friends would all be delighted to be challenged more in clas

Can you say more about what you've observed around "can't challenge your professors"? My professor friends would all be delighted to be challenged more in class. (The problem they're having now, especially post-Covid, is more often lack of engagement from their students.) And my memory of college from 30 years ago is that the debate about what we now call "cancel culture" was just as fraught; it's just that it was called something different by US conservatives back then: "political correctness".