I just graduated and can definitely back this up. Even though I was generally a good student I was always afraid to read remarks on my essays, less for what it mean for my grade but what it would mean about me. One time I misphrased a confusing title in an essay for a literature class and the professor wrote back that he was glad to see I got it right at least once because I "kept choking on it most of the time". Great, now I feel like a stupid failure even if I got a decent grade on the whole thing