Great questions.
1. I do not care for the inordinate amount of back biting that goes on between us as instructors. Every person (instructor) brings different experiences and training to the table. If we bad mouth each other, what does that do for the attitudes of new divers.
2. I have noticed that many (by no means all) shops are very slow to respond to questions or orders that are not readily available at the shop. Then many get quite indignant if you go elsewhere when you find someone willing to help.
3. I have a real problem with "been there done that" types. I am 6’5", 275lbs, and a 17 yr police veteran. I am a former SWAT member and have been involved in gun play. That being said, if I am not comfortable with a dive I DO NOT MAKE THE DIVE. People who feel the need to "prove" themselves to impress others drive me insane.