FarNorth
Baggs that's fine, but in a situation where other people are called by their names, or where a man is addressed as 'sir' while you get 'dearie', maybe you'd have liked it less.
I might indeed but the OP does not make clear, as far as I can tell, that she was the only person spoken to with an 'endearment' or supposed falttery. If I'd been in the same situation as described I might well have replied with a" Yes, of course, Young Man" (or Old Man if he was young).
Pondering this problem (which it really is for some people) while I was cooking this morning, it occurred to me that the use of 'endearments' could be more about the person using them than about the person at which they are directed, a smoothing over of social awkwardness on their part, if you like.
In the case at the hospital that I described, I imagine quite a lot of people going with injuries need reassurance and kindness as well as the right treatment. I suspect that's why some nurses use dears and darlings and it may become habitual. I really believe their intention is fundamentally good.
I prefer to give people the benefit of the doubt anyway. Being called dear, darling, young lady and such like does me and my dignity of self absolutely no harm whatsoever. If I think someone is being patronising towards me I might think them a patronising bastard but I certainly wouldn't feel patronised.
Maybe I've just been lucky or maybe I've just 'gone all Tao' (three people on three continents have suggested as much; I didn't think that up myself) and it all goes over my head. Saves a lot of angst anyhow.