If your friend is learning a lot, maybe he or she should continue to take classes and ignore the instructor's poor people skills. Try to learn as much as possible for the $400. Ask questions. I went through a similar situation many years ago. One of my karate instructors yelled and treated students like they were in Army boot camp. He was quite unpopular. Later he was killed while on duty as a policeman.
Looking back, I realize that the teacher did his best to create tough students who could defend themselves and their loved ones. His people skills were lacking, but perhaps he had good intentions. Maybe the pottery teacher is doing her best to share information in spite of her people skills.
Paragon Industries, L.P., Mesquite, Texas USA
email@example.com / www.paragonweb.com