Haha! My DS does that, too! I think it's a charming way for my DS to get his auditory, verbal, social, and intellectual needs met in the little gaps between play.
The teacher could as soon tell a fish not to swim. She doesn't understand or appreciate that he is an individual. Words might be his art, his way of seeing the world, and disapproving of that is effectively tantamount to telling him to stop being. I can't help but shake my head at some adults. Children are born with an innate curiosity and beauty, and adults who are supposed to support their development, in this case the teacher, instead quash it due to their own insecurity. It's sick that an adult should feel threatened by a 4 year old, but there it is.
