I recently sat through a Juried Exhibition that was just short of brutal. The purpose of this event is to get constructive criticism to help photographers improve their images.
There was plenty of criticism from one particular judge who was on top of his game when it came to nastiness. It wasn't that the criticism wasn't warranted, it was and the comments were valid.
The problem was with the delivery of the criticism. I feel that you don't want to put people on the defensive, but at the same time flaws need to be pointed out.
I don't advocate treating people like children. This is a delicate situation that needs to be handled with some tact.
What was missing was the tact. I'm not sure how you handle a situation like this, but hopefully an isolated incident won't take the fun and sense of purpose out of a club dedicated to photographic endeavors.