Overprotective?

  So my 8 year old came home one day from school, and in our usual fashion we discussed his day.  He told me all about his day, and included that he had given his teacher a back rub.  This disturbed me immediately.  I was scared and concerned!  I asked him some more questions about other kids being there, and if she asked him to rub her back?  I of course brought it up to my husband and knew that for my own sanity, I couldn't just let this slide.  I don't want anyone teaching or telling my child it is OK to touch them that way.  That is not their place, in my opinion. 
  The next day, he came home and said again, he got to pick a treasure from the treasure box, for giving his teacher a back rub.  Now she is rewarding them for physical touch?  Was this the start of my worst fear coming true, and my child having to endure what I did?  We didn't know what the appropriate response was.  I didn't want my problem with this to affect the way he was treated by his teacher, other members of the staff, and other students.  He already has enough struggles! 
  Since I was a young mom, I have always felt that I have been looked at as just a "young mom".  Which for some reason automatically means less smart, less qualified, and less competent.  I still get looks now for having 3 kids.  HELLO I AM ALMOST 30 and I AM MARRIED :)  I have always been a person to study up and learn whatever I can about something.  So when I became pregnant at 19, I started researching and reading everything I could about parenting and pregnancy.  I am not saying that I know everything by any means, or that I don't need to continue to learn about these things.  What I am saying is, give me the benefit of the doubt, before you automatically judge me as an uneducated person.
  I had a conversation with the assistant principal, deciding that we thought this was best.  Stating I was happy with every other aspect, but that I thought it was inappropriate for her to be allowing them to massage her and also rewarding him.  It's basically going against the boundaries that we teach at home.  And I didn't want her in trouble and I wasn't looking to make this public knowledge in the school, but that it needed to be handled.  He was very cooperative and understanding. Since then, the massages have no longer been happening.
  My first thought was, am I over reacting because of my past?  Is this abnormal behavior in every ones mind?  Turns out, most people I asked, agreed with me.  The thought that as they get older, I lose more and more control of their surroundings, people they come in contact with, and the ability to protect them....terrifies me!  I know there isn't anything I can do about it, and it is a part of life, but that doesn't make it any less scary or hard for me.