my kid has a similar situation (K1) last yr in a famous kindergarten, although it is not as serious as your situation. The kinder is famous, but of course not all teachers are caring and loving.
Frankly, my kid's teacher (young girl) always complained about my kid saying something inappropriate (while to me, my kid is just saying something descriptive and means very neutral).
I almost wanted to complain to the school and asked the "ju yam" why this young teacher is so intolerant about petite matters. but I controlled myself and didn't complain. My friend, who is also a kindergarten teacher, told me that I should suggest to this young teacher that, "oh teacher, I am sorry to hear what you said about my kid because she doesn't perform this (bad) way in other situations. Could you help me to see some positive side of my kid in school so that I could feel more "on sum"?"
I tried this (because you know, this young teacher has high self esteem and you cannot really tell them that they over-react to children's misbehavior). And it works!
And this year (my kid is at K2), this young teacher is actually helping me a lot and chatted with me a lot on other personal things that I think she would not tell others. She also did not write bad things in my kid's report card in K1. It was strange, but is a miracle.
Don't jump to thte conclusion at this stage:
Possible problems:
1. the teacher has problem
2. the children has problem
3. the school style does not fit your child
4. the environment such as the classmate has problem.
I suggested you spend some time talk to the teacher, principle, othe parents and your child to find out problem before making s decision to change school. As I am sure you dont want this problem still happen after you have chnage school.