Can you go in to help one day and observe the class. I wondering about this teacher?
Schools here don't work like that - no such thing as parent volunteers, so even if it were permitted, it would disrupt the class just by being so unusual. It would be nice to have unmediated evidence, though - DH and I were saying that it's quite tempting to put a bug on DS :-) I have a great deal of admiration for DS's teacher, and am convinced that she is working hard and open-mindedly at helping DS, although being human and having the rest of the class to deal with she does not always do the thing that would be ideal for him. She is intrinsically quite a difficult person for him to deal with, but she's certainly well within the bounds of reasonable person he needs to be able to deal with, so although I think he may have an easier time with another teacher, I'm keen to help him learn from this year.
Maybe you can look this up for more info. I'm not sure of where. I recall around K kids have a hightened conscience. They can feel like the teacher is yelling at them all day but it's their conscience. Pefectionism can come into play here.
That's interesting: DS certainly has a tendency to see any kind of help or correction as "telling off", even when his teacher doesn't intend it that way.
Thanks for your input!