You should definitely let the shop owner know about her unprofessional behavior. As for your lunch, you are an adult and can take a break or eat lunch whenever you like. She doesn't have to like it. You are paying her so you are the boss the way I see it. I'm sorry you had a bad experience. At my LQS, classes are a joy. Everybody is always helpful and relaxed. If the shop owner knows about her, then maybe they won't use her anymore. If you do sign up for another class, be sure to ask who is doing it. Good luck!