What happened between you and the teacher to get to the principal?
You described in the question that the teacher bullied your son, how did you bully him?
What happened between the teacher and the child?
What happened between you and the teacher?
My understanding is that it may be because the teacher disciplines your son in the wrong way, or because of the excessive behavior, you see this behavior as bullying your son, so the relationship with the teacher is frozen.
Maybe the teacher's discipline is not right, but bullying your child, feel it is not enough, right?
But in any case, the teacher's original intention and starting point for disciplining children is still good, and disciplining children is also for the sake of children to be good.
This matter got to the principal, in the end it is still a bit excessive, and you can also see that you have a little tendency to protect your children.
Now that things have gotten to this point, if you can't make concessions yourself and don't want to solve this problem, there is only one way left, to give your child another school.
Don't blame me for speaking directly, as you can see from your description of the problem, you only see the problems of others, not reflect on yourself.
I believe that there is no special reason, as long as it is a normal teacher, it will not bully a certain child for no reason.
Teachers discipline children is a very normal thing, only responsible teachers, teachers who are attentive to children, will strictly demand children, will discipline children.
It should be said that it is a blessing for a child to meet a teacher who is strict, strict, and able to discipline himself.
In the current educational environment, there really aren't many teachers willing to discipline students harshly. Because it is good to manage, it is good to be well disciplined, and poor discipline often brings a lot of trouble to yourself.
I believe that your child's homeroom teacher has encountered such trouble.
In fact, it is normal for teachers to discipline children, but it is not normal to teach them.
I don't know how you understand the fact that the teacher disciplines the child, but the calf is not loving the child, but harming the child.
I wonder why you understand teacher discipline to treat children as bullying children?
Why would a teacher, an adult, as long as there is no moral character problem, bully a child for no reason?
Besides, the contradiction between you and the teacher has intensified to such a point that they have already made trouble in front of the principal, so how will this teacher discipline the children in the future?
If you want to solve this problem fundamentally, then please put down your face and sincerely ease the relationship with this teacher.
If you still can't put your face down and are not willing to do this, there is only one way in front of you, and you can only change the school for your child.
In addition to this way, other extreme ways can only make the problem worse and worse. In the end, the teacher will be affected by some anger and influence, but the most fundamental thing is to harm your own children and harm yourself.
In the end, it is recommended that you calm down and think clearly, and there must be no other radical way to deal with it.