“Most professors, even the most committed leftists, like intellectual give-and-take.”
Nothing could be further from the truth. They do love ferreting out people who do not follow leftist orthodoxy, but this is followed by a myriad of grade and career punishments. They do no respect the concept of free debate and of opponents not being evil.
There are far too many examples and it indicates a pervasive cultural reality.
Pay closer attention. Speech codes, lists of “microaggressions” and the like for the most part come from administrators, not professors.