This situation is a little like having to sit straight and put a napkin in your lap when an older relative visits for dinner. It's not fake. It's showing that you care enough to pay attention to details that matter to your visitor, even if it isn't the normal way you would do it. Furthermore, it's a learning opportunity for you. It's not uncommon for such a visiting sensei to spend an hour or two on etiquette at the start of the seminar anyways, especially when dealing with a bunch of beginners. You can also expect a good long lesson on the basics you think you already know. I agree with the majority - you are in the wrong here. You got rebuked, and rightfully so, by your instructor. Now you're making it worse by whining about it in public. I say zip your lip, do as your instructor asks and take advantage of this fabulous chance to learn from a very high level instructor.