I'm involved in a search and rescue team. Is it OK for me to ridicule someone who is lost and I'm out in the woods looking for?

A good friend of mine is a paramedic, and if I ever go to the bar with her and her paramedic buddies they sit around the table / bar making fun of patients. So far as I know, they never actually make fun of anyone to their face, but it's a way of relieving stress from their job. This is where I think it gets to a gray area. No, they shouldn't make fun of people on the job. But if that's a defense mechanism, and they are only human, isn't it forgiveable? (Not that it isn't interesting listening to the stories about old men who shoot themselves in the foot cleaning a loaded gun)