Actually, I don't think it is so much an issue of teaching patience/compassion as teaching acceptable responses in the classroom setting. She may have to deal with annoying/exasperating kids (whether due to learning challenges or something else) in her group, if not currently, then at some point in the future. That kind of incident would have landed her in trouble due to zero tolerance at our school. It's great that your DD's teacher was so easygoing about your DD's yelling and her classmates' crying. For a 3rd grader, it may just be simpler to tell her that she may not yell at her classmates no matter how coginitively slow they are as yelling and causing other students to cry would get her labeled as a problem student.