I had a terrible professor that was actually reasonably competent at teaching (the material wasn't hard in the first place, but still), but was terrible because

I had a terrible professor that was actually reasonably competent at teaching (the material wasn't hard in the first place, but still), but was terrible because of how she behaved in class. The best way to describe it is abusive. As just one example: She'd do this thing after every exam where she would call off each name one at a time, have them walk to the front of the class to get back their graded test, where she would then berate them for anything they got wrong on the exam. It didn't matter if you got a A, if there was single thing wrong on the exam she would berate you over it. Really vicious personal attacks. It was so extreme that for a class of 20-30 students, it took the full hour to hand back tests. Averaging 2-3 minutes per student, yelling at them in front of the entire class. Needless to say she always got awful reviews from her students, but if that effected her career, it was not apparent.