I have been in some of those classes too, and I agree that it's disruptive and disrespectful for a student to insist on doing something different. After all, you paid to attend the class to learn from the instructor, so why not keep an open mind and at least try her methods? If, after you get home, you decide to continue with your old methods, that's fine, but don't dismiss the new methods until you've tried them, and never during the class.