DS (aged 10) is on crutches because of a long term hip condition.
When we're out in public, complete strangers will ask him "Oh, what have you done to yourself?" "Were you playing football?"
I know they're trying to be friendly, and that I'm being touchy, but I'm sure they wouldn't ask this of an adult on crutches.
DS or I usually shut the conversation down with "it's a hip condition".
DS hates it because it highlights he's "different".
PIL have suggested he starts making up outrageous accidents instead "I got it sky diving..."
But it drives me mad.
Some people quietly say to me "do you mind me asking ..." and I absolutely don't mind explaining. It's them putting DS on the spot that I hate.