As a store owner I try really hard not to roll my eyes... at least not in front of the customers... but sometimes it's damn near impossible not to go cross-eyed.
Here is a recent story that made my eyes roll and steam come out of my ears...
So I've got a brand new diver, literally just certified who reads everything he can on his new found sport. He is literally in my store on a weekly basis, sometimes 2 or 3 days a week and sometimes even 2 or 3 times a day.
He asks for advice on everything... and I mean everything. So I try my best to help him out and answer every last question with my honest opinion... always prefacing what I say with "this is how I do it... but others may do it differently. There is no wrong or right in gear configuration... it's mostly personal preference."
So he comes in and asks for advice on how to mount (carry) a pony bottle. I tell him it's a personal preference whether to tank mount it or sling it.... but he keeps pushing me wanting to know what I do and what is best... so I tell him exactly what I do. I mount it upside down on my primary tank and I pressurize it and then turn it off before entering the water.
The next day (I was off,) he comes into my store and tells my employee that I gave him bad advice and that I was trying to kill him. He had been to Scubaboard (I had told him about the site when he took his OW class) and read somewhere on here that turning your tank off was an absolute no no and placed you in great danger.
My employee called me to tell me that he did this in the store in front of other customers and he was visibly upset and shaking and ranting and raving. I rolled my eyes... blew steam out of my ears... and the next time he came in my store I let him have it.
I then started a thread that same day on Scubaboard asking for opinions on how people mount their ponies. Somewhere between 70-80% did things pretty much the same as I do... so I emailed him the link to the page... he read it, came in the next day and apologized.
Through all of this, he has remained a customer... why? Because he discovered I was right... figured out I cared enough to take the time to point him in the right direction, accepted his apology and forgave his actions... and because I give him great deals on everything he needs. He now understands that opinions in diving vary greatly... and that just because 70-80% do it my way... there are still 20-30% out there that do it their way... and each of the ways works just fine... some maybe better than others... but that's what makes us unique... we can all be different... but still dive the same...