Critical thinking skills expose conservative students to viewpoints beyond their own. Conservative students are more likely to come from less diverse areas, rural areas, religious backgrounds, and to have narrower experiences. All of that breeds rigidity. Being exposed to new information is the goal of every single class in the history of classes. For rigid people, that feels threatening. They prefer their conservative bubble.
So broadly, those complaints are largely snowflakes whining that they've been presented with info that challenges their biases. I won't rule out the existence of such professors, of course, though I think they're rarer than you think. I doubt you're willing to concede as much because you're one of the rigid.
At last count, there are two liberals who post here regularly. If you think we're the primary perpetrators of harassment and name-calling, you're dumber than I knew.