So ds was at a birthday party yesterday and was waiting in line for a while for balloon models. Two other children physically pushed in front of him, pushing him while doing so. Ds started to get upset so waited to see if parents said anything they didn't. So I went up told the other children not to push in front and wait for turn, then put ds back in original space in cue. When walked back to where sitting, one of the parents gave me a death stare. Aibu for doing this?