What you need to get from the teacher is exactly how he is misbehaving and what the circumstances were surrounding each outburst. The more information you have, the better. I am not impressed by a teacher who, a week into school, has already decided she doesn't want a child in her classroom (which is what she is saying by not letting him come back that afternoon). I sympathize with her frustration, more especially because I know it's not something I could handle, but as you said, this is her job and she should be willing to try for more than a few days before giving up. Stick to your guns on this one. If we were talking about an ongoing problem halfway in the year, it'd be one thing, but this sounds to me like someone just doesn't want to make an effort. And that's not acceptable.