If i think it would hurt someone I might if they seem to be trying to learn the ropes so to speak. I used to get irritated at this group of tools in my last gym that went around correcting everyone and even showed bad form themselves. It was very annoying but since they competed in some local shows and their pics were on the walls people looked at them like Gods. There was a guy who modeled for Abercrombie who did 120s on the incline and he was tall and wormy and I used to watch him help people. He did it the right way and seemed to always get people straightened out without them being offended. Then again he was all over walls too.