Yup . My math classes included a LOT of boardwork at the front and the back of the room . I worked my ass off to make sure my students understood that the board was meant for discussion and sharing , not judgment . I also had students with social anxiety disorders , who couldn ' t do boardwork for fear of being in front of the class or fear of even being AT class even after coming up with boardwork alternatives for them , I had to make doubly sure that they weren ' t intimidated by the discussionoriented nature of the class . To me , the idea that somebody would hold students ' mistakes up for mockery like this is gutwrenching . Students who make a mistake are students with an opportunity to learn , but that opportunity disappears in an instant if you act like a jeering asshole about it . God knows I ' ve made well more than my share of mistakes in learning what I have so far . And since I ' m kind of a dumbass , I still have plenty more to make . I ' d like to think I make them in a way that fosters learning and correction , not mockery and derision . This prick needs serious correction . And the department chair who allows this sort of thing needs a lesson in pedagogy , too .