You are not being overly protective of your son. What is your son learning from a first-grade teacher who rips up kids' unsigned papers in front of the class and tosses their wrongly-placed backpacks in the trash? He is learning how to humiliate people under the guise of teaching them a lesson. He is learning to be afraid of teachers and adults in powerful positions because they can do terrible things to him whenever they want. He is learning to associate going to school with being shamed and being scared of what will happen to him if he does something wrong in the eyes of a teacher.

This insensitive teacher's shaming of her students needs to be stopped. I suggest that you contact several other parents of kids in your son's class and arrange a time to get together to talk about this teacher's harmful behavior. Draft a group position statement on her acts of humiliation and ask to meet with her in a cover letter. If you cannot compel her to stop punishing the kids in this manner, take your grievances as a group to the school's principal. There is strength in numbers. Keep moving up the line of power in your school system if you do not receive satisfaction. Regardless of this teacher's possible attributes as an educator, her acts of humiliating her students in the manner you described render her unfit to teach kids. I am pleased that you are going to take appropriate action. Even though your son hasn't been directly punished by this teacher, you've seen how her insensitive actions have damaged your son emotionally.