DN was working on a compter yesterday and leaned back in his chair (shouldn't have done this) but he knocked over a cup of coffee that went over coursework. The teacher yelled at DN and called him a bloody stupid twat.
DN wasn't bothered and seemed to find it quite funny but I think I'd probably have to say something to the teacher concerned along the lines of it not being acceptable. DN is in Year 10 by the way (15.)
AIBU?