Being a DM doesn’t mean you are even a good or experienced diver, it just means you Put Another Dollar In to training :( And yes before I get flamed I was a DM on NJ boats and I stopped paying for the insurance!
My wife won’t be around suited up divers except me after her DM in OW training hit her in the head with an AL80
In Cayman we needed to pick up a DM who went down current from the dive site. He had hundreds of lake dives but this was his first ocean trip and had never dealt with current before. His student had enough sense not to follow him and stayed under the boat but he left her and couldn’t swim back.
In Bali we had DM’s from a country famous for poor dive etiquette chase the ocean sunfish and Manta’s away.
In Fiji we had an experienced diver who would see you photographing something and become a hockey player and body check you off the subject, there were 7 other photogs on board and we all just stopped pointing out subjects to her until she was down current from us :)