I always enjoy the look on the face of the shop tech when I pull out my ADC - Air Range - Commercial Diver card.
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I did once run into a person at a shop that wanted to see my nitrox card. I explained I wasn't getting any fills nor was I renting any tanks. She informed me I still needed a nitrox card to dive nitrox off their boats. I told her I was diving air. She wasn't happy about that and assured me the boat crew would check my mix. They didn't. Wouldn't have mattered as I was diving air and I happened to have a nitrox card in my pocket. Of course this was the same woman who thought you needed a different amount of lead for a night dive.
I wonder, it you have a "PADI" DM or Inst. card and you go in to a PADI shop for a Nitrox fill, do you think that you would get denied because the card does not say, spacifically "Nitrox Diver" on it?