Don't shoot the messenger lah.
The messenger may have delivered it not to our likings, but read the message, and its content.
I don't see the name of the instructor (since it has been removed) already. That's the beauty about internet

Some say to close this so we can start fresh. Good idea.
Some say to keep it open and continue the discussion. Also good idea.
My 2 agorot:
1. the dive instructor should be professional, so he/she should be able to take the beating no name mentioned some more. And there are always people who will be looking/watching at them

So that should keep them up on their toes; they get paid, what?
2. the divers, us the consumers, see from so many angles, and we get to choose who we like to teach us, where, and when. Don't we?
for those who want to start fresh discussion, please feel free to do so.
for those who want to keep this open, please continue talking here based on facts.