Agreed; outrageous behavior.
This is clearly bullying.
Does the school have a written policy somewhere for faculty/staff conduct? An anti-bullying policy in writing anywhere?
Because this definitely crossed over the line-- assuming that everything that your child has reported to you is entirely accurate, that is.
I'm not saying that it isn't, by the way, just that it may require more investigating on your part before you level that kind of accusation at a teacher.
It certainly doesn't seem as though the administration is as interested in meeting your child's needs as they are in offering lip service to that end, however, and THAT really would have me pretty steamed, even without the teacher's bullying of my child.