The student teacher relationship is a very interesting relationship. Especially now, as a teacher, I can see how students dictate the direction of the relationship. Now I don't want it to seem like teacher's personalities and teaching style do not affect the relationship; the important thing to remember is that TEACHERS ARE NOT PAID TO BE YOUR FRIEND! I know it sounds harsh, but its completely true. Yea, I'll be the first one to agree that some teachers suck, but it is the students responsibility to get everything out of that teacher. Weather you personally like the teacher or not, he will have some type of valuable information for you!
Having this mindset will dramatically alter your attiude towards lessons and ensemble work. I constantly hear friends and students complain about teacher's personalities, teaching styles, and the teacher's ability to play. Well everybody I have news for you, STOP COMPLAINING AND GET A NEW TEACHER!
From my experience teaching, students bring certain expectations and attitude to teaching situations which really drive the experience. As a student, you must realize that there are many things that you do not know because of your lack of experience. Teachers have overcome all or most of the problems you may be facing. Experience is a huge difference between students and teachers. There is such a big difference between a student and professional musician. Students and professional musicians have two completely different outlooks and approaches to music.
At the end of the day the student is the one who loses from a negative relationship. Most teachers already have established careers. In a sense, students must trust that teachers will lead them in the right direction.