Question 072: Bad instructor

I have been taking Taekwondo classes in a small town. My instructor has been rushing students through forms, one-steps, and sparring, causing a number of students to drop from the class. When I ask for help on learning a something, he ignores me. When teaching us one-step techniques, he demonstrates all types of variations which confuse us. One night, he became visibly frustrated when I could not accomplish a technique properly and grabbed me too hard so I gave him the finger; I later apologized. He considers slow learning students as being “a bit on the retarded side." I brought two friends to class one night, one of whom had years of martial arts experience. When the friend asked too many questions, the instructor accused me stirring things up, said he would refund my money, and that he did not want to see me or my friend again, Is there a way of verifying if this instructor is bona fide. Should handouts be part of the standard curriculum? What did I do wrong?