It depends. While it might seem convenient, it's usually not a good thing. It's illegal and unfair to the comic creators who put in a lot of effort and deserve to be compensated for their work.
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One common reason could be his strict teaching methods. He might be seen as too harsh on students, not allowing for enough creativity or individual growth. For example, his no - nonsense attitude towards discipline could be perceived as stifling for some students who need more flexibility in their learning environment.
There was a PE teacher at my old school who would often cancel PE classes without any good reason. When we did have class, he would just sit and watch us instead of actually teaching. He didn't bother to correct our form or give us useful tips. It felt like a waste of time and we didn't learn much about physical fitness from him.
I knew of a teacher who was extremely unfair in grading. She favored certain students and would give them high marks even when their work was mediocre. Meanwhile, other students who worked hard got much lower grades for similar quality work. This unfairness created a very negative and competitive atmosphere in the class.
One time, my math teacher would always yell at students for not understanding concepts immediately. He never took the time to explain things differently. If you asked a question, he'd make you feel stupid.
Sure. I once had a teacher who always favored certain students. He would give them more opportunities to answer questions and praise them constantly, while ignoring the rest of us. It made the learning environment really unfair and demotivated a lot of students.