I noticed after returning to NC State, that when studying I can hear the echoes of my instructor's voices repeating some method or recommendation. It fades. Usually, it is helpful - it comes with the lecture format - but it can be detrimental if your instructor purposefully wastes class time with neurotic personal complaints, is deliberately argumentative, is obnoxiously loud with random outbursts, can't stay on topic, and to top it off, fails to cover the material.
Speaking for myself, it just causes anxiety and a desire to avoid studying. Why would I want the memory of that kind of voice in my head?
Fortunately in a college environment, there are options like dropping or section switching, not to mention a formal complaint process.