I hate to say it but, you are part of the problem that is inherent in modern day schools. This tape is NO big deal, the teacher is older and the children should have no right to speak in class out of turn.
You must be one of those "Children are to be seen, not heard" people. How do you expect a child to grow into a capable adult if you inhibit their growth and creativity when they are children?
The tape is a big deal in my opinion...it is the device of a control freak!