Yeah, I agree with others. I don't know all the details, but to me this does not sound like a positive and constructive learning environment. Lessons can sometimes focus on just one goal, (sight reading, theory, technique, etc.), if requested by the student and deemed by the teacher to be a reasonable request; however, I have always favored a comprehensive approach to lessons that is diverse. I favor a variety of approaches in lessons that includes ear training, theory, technique, sight reading, and a number of other practical aspects of musicality. Above all, it's hard for me to think of occassions when playing unplugged is a good idea. And further, thinking of situations where the teacher doesn't have an instrument is even harder. It might be time to look for a new teacher. At the very least, address your concerns with the teacher. It's your time and money. If the teacher hears your concerns and presents reasonable arguments for his approach, so be it, decide if it works for you. If the teacher doesn't really hear your concerns, or can't defend his approach, it's definitely time for a new teacher.