The worst teacher I ever had was my college photography teacher. At first she was nice, then I ( appropriately) corrected her on one thing, and then she started to treat me like crap. if I showed my knowledge on the subject (which I have plenty of due to 4 years expierence and a criminal photography course I already aced.) as predictable as the tide next class she would find a new way to make me miserable. She even went so far as to call my diabetes an EXCUSE for a assignment being late. I eventually dropped the class, she gave misinformation, and presented her opinion as fact, and she couldn't tell the difference between a moth and a butterfly.