My daughter is in 5th grade and another girl called her that too last week. My daughter told the teacher and the teacher told my daughter not to be a tattle tale. My daughter has some serious struggles with perfectionism OCD so she very often feels like she needs to correct other people, much to her older sisters chagrin, so I imagine she brings a lot up to the teacher. I had a conversation with my daughter that she can’t control others peoples actions but I can’t believe that the teacher said that to my daughter.