Even though you didn’t say it, as my linked post’s cites illustrate, “things like evolution in a biology class” are in fact a major source of actual disagreements between self-described conservative students and professors.
I think it’s a bit disingenuous for conservatives to complain about “liberal academia” being biased against conservatives without acknowledging that a large part of the way self-identified conservatism manifests itself in higher education is through viewpoints that are stubbornly anti-science and anti-fact.
The modern US conservative movement has a real problem with its dependence on its militant pro-ignorance wing that, for example, swallows all kinds of false statements and conspiracy theories from right-wing sources, while at the same time denying the validity of key science on, e.g., geology and biology and climate change. I’d like to see at least a few conservatives honestly confront the seriousness of that problem before indulging in their routine whining about how academics are so unfair to conservatives because they’re brainwashed socialist hippies who can’t see past their own biases or something.
And the intervening time provides a lot of opportunity for confirmation bias and false memories to get baked in by ideological antagonism. Given how much difficulty students often have with remembering what their professor said in yesterday’s lecture, I’m certainly not taking anybody’s unsupported word for how many “partisan soapbox rants” they heard in class nearly twenty years ago.