I recently made a protocol mistake at a cathedral in Madrid. A few other folks agreed with me that it was not clear and we’re surprised too. It was a tour guide that took it on his own authority to yell across a room to correct me. I immediately in a regular tone and voice apologized and told him I was not aware of the rule in that room ( started taking a picture in a room with no photos) and no signs saying no photos. He immediately in a very loud voice told me I was wrong, and I knew I violated the rule on purpose. The dozen or so folks in his tour were visibility shaken as everyone in the room stopped and looked on at the commotion. I was not having ANY of that BS. I then raised my voice across the room and loudly sad, you are wrong and I don’t appreciate your accusation. He again said I knew the rule again said you did on purpose. I returned with an equally loud voice and said “ what tour company are you employed by”? He did not answer the question , but replied again that I knew the rules. I then replied wrong again buddy. By this point I’m pretty damned bent. I was going to have the last word. I then very clearly and loudly said “ rude and unprofessional”. He realized he screwed with someone who would not back down. I walked out of the room right past him and his tour group. It was totally awkward and uncomfortable. That guy assumed because I was a tourist he could “teach me a lesson”. I assumed that if I quietly apologized for my minor error he would accept and go about his business. We were both wrong. I have no doubt he received some pretty poor ratings and minimal tips. He made a room full of people feel a awkward and bad. I’ll try owning up to mistakes I make, but humiliate me and I’ll send it back over and over again. This happened last week. It’s been my only negative “ encounter” since I’ve been touring.