Oh sure, it's all the evil teacher's fault you didn't pass calculus.
The real world is much tougher, in any field. It's far easier to switch classes, or just don't bother, than to switch bosses, because that means switching jobs. And there are a lot more evil bosses out there than evil teachers.
When I was in university, I had only one professor who was a weirdo, and that was a law class. I didn't let that stop me from continuing to learn law -- to this day! I'm not a lawyer and not interested in being one, but to turn your nose up in an important subject matter because you didn't like the teacher is juvenile.
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