The OP can't. This is the thing. Some of these folks have never set foot in academia, or would have never had made it to, say, Harvard on merit.
But they sure know about "indoctrination in collage(sic)".
I spent 10 years in college, and I can only count 2 instructors that were into that kind of behavior (one from the left, and one from the right.)
Every other professor I had was simply trying to do their job. A few sucked, some had terrible personalities, but hey, we are all human. Everybody else did their job, and I thank them for it. Some of them became my mentors who helped me get through my education. Some were even counselors that got me through some dark moments (because college is challenging, specially in STEM fields.)
So I ask, just like you, what indoctrination are these fools talking about?