I know what u mean. Any parent would feel pain if the child is severely criticized.
That happens to my daughter every week too. I also feel pain when my daughter is severely criticized. But I just tell myself, "A criticism is a Gift." I prefer a good strict old skool violin teacher.
Good suzuki teachers, especially those trained and certified in Japan may tend to be very strict, because the Master expects perfection and absolute dedication from their apprentices.
So the child apprentice will have to put up with the Master's criticisms and endure and stretch him or herself to improve. That is the traditional Japanese way, and Suzuki is a Japanese method.
Just my 2cents worth of thoughts. haha