Hmmmm -- I can hear someone thinking -- what happened here?
There were two things this particular instructor did (and I ran across a similar occurrence recently which led to an interesting "discussion" with another "diving professional"):
a. Mock, criticize and otherwise make fun of other divers doing pre-dive safety checks; and
b. Falsify required dive logs on the BOAT's dive log (this particular boat had a requirement that ALL divers log their dives on the boat's dive log).
I thought, and still believe, this was "unprofessional" and did not meet the standard an instructor must have. I also thought that IF this was what he really thought about diving, how could he teach me to be a "professional" in the diving arena?
It's interesting that people brought up gear -- as is so often the case, the gear issue is raised but is mostly irrelevant to how one dives -- as long as the gear works, who cares?
BTW, I did unload on another instructor/DM who made fun of me for doing a thorough pre-dive safety check (that is, making sure both regs were working, that my BC was inflating/deflating and that I had all my gear on properly -- in other words, a 60 second check) on another tropical dive. I told him, in no uncertain terms, that it was very unprofessional to mock people who do safety checks and that, to the contrary, he should have made a comment to the rest of the boat that THIS is the way it should be done.
You all, of course, are free to disagree with me.