How to politely chastise a rude stranger?

by Shawty
(Fairfax, VA, USA)

It happens more often than I can handle, usually when I am in an already awkward situation, like on an elevator.

Some stranger will ask me out of the blue if I'm a midget. I don't find it unusual for people to comment on my size, since I am very petite, only 4'9", but I am very offended and taken aback that they would just blurt out something like that.

Not only is it politically incorrect to call a little person a midget, but I am clearly just tiny, and have no visible deformities characteristic of diseases that cause dwarfism.

Why do they find it so amusing to embarrass me? I know if I did truly resemble the lollipop guild they would never say something so brazen.

That's like approaching a stranger and exclaiming that she's overweight, or joking about the glare on a bald man's scalp.

I am tired of laughing and politely deflecting and I would prefer to say something to let them know their comment is unwanted and unwarranted. Can you please help?