I have been in several yoga classes over the years and one thing that always seems to come up is whether or not an instructor should make physical adjustments during a class.
I know that there are as many opinions on the subject, as there are people, but it is certainly one thing that every student should understand.
I am a huge fan, first of all, of asking questions respectfully during a class. If you are new, you need to understand what it expected of you and what YOU can expect in return. In that same respect, I believe that every instructor should be up front with how they teach, putting any new students in the room at ease...especially if they have never taken a yoga class before.
Personally, I do not adjust my students. I was brought into the world of teaching yoga, by a wonderful Guru (my dearest Rupaji), who instilled in me the belief that we all are full of energy, both good and bad. If I am having a bad day, or suffering in any way, I don't want to transfer that energy into my students. The same goes for students who may be having a bad day, transferring their energy to me.
I have been in classes where there is a lot of hands on adjustments done. There are certain styles of yoga that thrive on it. But, if we are indeed doing yoga with ease and in a manner that is comfortable, adjustments shouldn't be necessary. Now that doesn't mean a gentle touch between the shoulder blades when they need to relax isn't helpful, it means that I don't push on that area to force relaxation.
I go to one class where the instructor does a very short neck massage on each student as they rest in savasana. It is really a sweet and wonderful touch.
If you are in a yoga class, it doesn't matter if you are a seasoned yogi or new to the practice, if your instructor asks if you mind being touched, be honest. No one should be offended by that, and if they ARE then you might want to seek out a new instructor.