OK...15yr old DS came home from school and said he got in trouble for correcting a teacher. Here's the scenario... In Math class, teacher says ' When you plus x and y, you get z. Plus? It wasnt an isolated incident, she had been saying this since the beginning of school several weeks ago. Does the same thing with minus. 'When you minus y from z, you get x' So, he started correcting her, when she would say plus, he would say add. I want to reprimand him for being disrepectful, but I also want him to know that he was right. How to handle?