Kyler was very quiet and upset looking. I put them in the van and stood there asking him what was wrong. He said he left the classroom today and knew it was bad of him to do. Sigh. He's been watched by so many people besides DH and myself and doesn't do this stuff, why now? So he left the room and went into Cameron's classroom. He said his teacher came and got him, yanked him by his arm and dug her nail into his finger (he has skin missing on the knuckle of his thumb, a very small piece is missing). She took him back in his room, put him in timeout, told him he was a brat for not listening to her.
I would ask for a meeting with both teachers (and principal if available) to happen tomorrow and I would make myself available anytime of the day. I would consider how the child feels about going to school tomorrow, and use the fact that he left one classroom to either be with his twin or twin's teacher as a launching point to try to get Kyler moved. If needed I would bring in/cite documentation on splitting up twins in their first year an institutionalized school setting. I would try to put the emphasis on Kyler's feelings and how the environment in his classroom is affecting him over my own feelings on it. I would go in with the advocate-mom hat on and say "This is what my child says, fix it". If the child is confused over what really happened then the teacher still needs to resolve it with the child. She may or may not have said "brat" (to me it's a moot point), if he interpreted her actions or words to be calling him a brat then that's what he believes. It needs to be dealt with either way.
Whether you pull him out or not this still needs to be dealt with so he can understand what is going on and get personal resolution over it.