I am sufficiently... dragon-ish (and fat) that people tended to not react to it weirdly? Also, it was working in a deli, so I was behind a counter always.

Now that I am thinking about it, it was always older men. Certainly no one below the age of 40/50, or anyone who... looked socially maladroit. I didn't even think about it consciously. Those people would get a "sir."