Resigned from teaching job because of Abuse

I recently accepted a teaching position as a lead pre-k teacher at a daycare. After working there only two days, I observed such abuse that I decided to resign and report it. I wrote a letter to the director and I would like to post it and get others opinions on whether they agree that is is abuse. Here is the letter:

I worked in the Pre-K 2 classroom as the Lead Pre-K teacher and I observed certain discipline practices that I do not agree with and do not feel are healthy for the children. Having a degree in Child Psychology, I understand the harmful effects that yelling and using harsh tones can have on children. When a child did not listen or misbehaved, that child’s name was yelled by (the assistant teacher) and she would harshly instruct them to do the proper behavior. Many times I noticed the child that was being yelled at would have tears in their eyes or would then withdraw from all activities. Some of the children who were being yelled at were new to the classroom, and rather than gently showing them the right way to behave, they were made to feel unwelcomed and humiliated.
The most shocking practice I observed occurred at the end of nap time when the assistant shouted the children’s names to wake them up and I even observed a particular incident where she shook a child’s cot in order to wake them. The children woke up so abruptly and then were immediately made to carry their cots to the closet. In all my years in child care, I have never seen such a practice to wake children up and I do not believe it is right.
The last incident that I did not agree with occurred when a child tried to give me a hug. Anytime a child comes to me to give me a hug I always hug them back. I believe this makes the child feel secure and establishes a caring bond between child and teacher. During this incident, the child hugged me and the assistant harshly said “Get off Miss (my name)!!” I could not believe what I’d heard. At the young age of 4 and especially with being the first week of school, no child should be denied a hug.