Hi LilliDew: First, welcome to the group. It's an incredible place for asking & sharing all kinds of great info.
Like others before me, what you describe does sounds *very* creepy. As a male, while in the uro's waiting room, and while noticing of others wearing diapers (gee, like that would be unexpected), I didn't approach them about their problems. Small talk, maybe; but nothing as personal as that.
As for "showing" others that I wear a diaper? I've *never* done that (at least not on purpose

). Why would I show a stranger my underwear; especially a member of the opposite sex??? I have had discussions with "strangers" about being incontinent and living life with diapers. But that's because my doc regularly "pimps me out" when he has a struggling patient in order to help out that patient. And that's by prior agreement/discussion. Even so, I've never flipped my shirt up and said "check me out". What's the value in that act? ... that just sounds plain wrong.
I would avoid him ... Something doesn't sound right.