I like your answer the best:
"Or you could embarrass them: "That's a health-care device. It's very personal, and I'd rather not talk about it."
Many times I have wanted to answer people back with something equally rude and later was glad I didn't. I'll go pretty far to make a friend instead of an enemy when I can...
Frankie, be nice or you may just be deported... Back to the North...
