Consider this: what if you were a medievalist and the majority of your public simply refused to accept that Charlemagne ever existed. Indeed, what if they felt their prosperity was contingent on not acknowledging it. And thus all your medievalist friends spent a great deal of time proving that Charlemagne did exist.
Think about all the other interesting questions you might never get to ask, because you were spending all your energy in refutation of myth. And this would be frustrating because surely you had true questions, questions which you actually didn't have answers for. But every time you presented your work before an audience you felt called back to 800 AD all over again.
I think about how the climate scientist, or the evolutionary biologist living in Tennessee must feel, and I find some sympathy. So much of black intellectual life is wasted in disabuse, in explaining yourself to other people, as opposed to yourself.
Above all, I think this is the case for HBCUs. It wasn't like we didn't talk about racism at Howard -- where Toni Morrison attended -- but we never had to explain. And we were free to consider the geography of ourselves, to understand ourselves as another country. I remember going to the CSA (Caribbean Students Association) parties. It was like some other parallel world. Or watching the fraternities and sororities come out in the Spring, something I had no understanding of at all.
This, presumably, explains the frustration at having to repeat "101" level material over and over and over again. When I was newer at this, I couldn't understand the frustration -- probably because I remember when I was 101. Nowadays, it's far more clear to me, though I still do my best to be patient. It really depends whether someone is being deliberately pugnacious or not. But either way, having to spend huge portions of one's times reinventing the wheel (or Charlemagne) is time that one can't spend pushing the ball forward, and that really is annoying.