The only really odd thing that ever happened to me because of disclosing my true qualifications happened in Turkey.
The operator was training a new DM (a Dutch guy as it turns out) who had about 100 dives in total to his credit. I signed up for a dive as a single diver and when they asked me what my qualifications were I told them openly. They asked me if I had ever dived on wrecks and I gave them my North Sea wreck resumé and a few anecdotal stories.
The operator then asked me, again, quite openly, if I would be willing to lead the dives that we were going to be doing that day (they were wreck dives) and dive with their DM to "break him in" a bit.
I agreed on the condition that I went for free and that the DM fully agreed to this construction. They (and he) agreed. Legally, everyone who dives in Turkey must have a guide because the government is afraid of divers looting valuable artifacts, so if I was leading or following this DM I would still have been diving with him.
I made two really good dives with him that day. One was shallow over a debris field from a Roman era wreck. There were a lot of amphora but we went looking for octopus. The other was a deep dive that included a penetration of a wreck from the 1970's. We found an unopened bottle of wine and some kitchen utensils that nobody had found yet. He was THRILLED by the experience and I was happy as hell to have helped him along in his dream of working as a dive guide.
Again, diving with novice divers really energizes me. In this case I got some free diving and some good dives with a guy I liked! Who can ask for more.
R..