Nah, the teacher was just wrong about the facts. If they had been right about the facts, there's nothing wrong with saying that imo. The reality was that it was the partner who should have gotten that lecture rather than the author.
So I'd say that you shouldn't say that if you're relying on your own feelings and impressions to judge facts not in evidence, because your instincts may be wrong. They may even be racist or sexist (i.e. something that the person you're maligning has to deal with constantly), instead of in this case when it was just a weakness for ass-kissers.
Too many times somebody else got a good grade from my work. I don't begrudge them the grade because I don't care when other people get nice things for free (I love it when me or my friends get nice things for free), but they certainly had no knowledge in what had been taught in the class they just got a B in.
> Those people are the reason academia is such a miserable experience for so many.
School isn't a therapy session or entertainment. If it's a miserable experience and you come out smart, it's 1000x better than if its a wonderful experience and you come out dumb.