I would give her the benefit of the doubt - those 2 boys had probably been testing her all week and she had just reached the end of her tether. Teachers have to deal with some very difficult kids at school - kids that probably aren't getting the good example and discipline they need at home, and act out in class all day, which makes it very difficult for the teacher to teach effectively and give enough attention to the other children in the class. I was friends with my son's prep teacher last year - she is just a lovely lady, wonderful to her prep kids, but even she had a hard time with a couple of the kids in her class - and was heard yelling a few times. It happens. And the other kids understand - you would be surprised how well they understand. They know why the teacher is yelling and they don't take it personally.