I've had probably 10 minor events but the 3 that spring to mind are
1) at 6th form college a friend who I confided in told a few people and it spread. A girl I really liked was creeped out and had fancied me before. I've not been in a relationship since. 25 years later.

2) At John Bell Croyden (chemist in London with ok incontinence section) 10 years ago a young woman who worked there was talking to a young couple in that section. I waited patiently to ask for some medium tena slips and she was showing the 2 the giant nappies and cracking all sorts of jokes "people actually walk around in these not just soaked but full of crap! Sick", "I bet loads of them suck dummies and wear rompers too!", Etc
After a minute she looks at me and I ask if she can help and politely apologies and says she's on her lunch break talking to friends and calls a colleague over. Luckily she was more helpful!
3) about 7 years ago I was staying on the coast. I sat down a table for breakfast at my regular holiday cafe, had a chat and ordered. Shortly later I heard muffled laughs and turned around already sensing I was the cause. My hunch was right so I felt around the back and realised that my trousers had gone very low. I had recently switched from tena to molicare so they saw a large amount of a big pink nappy under a thick pair of Suprima clear plastic pants. I guess they thought I was kinky or whatever. I ate and left as soon at I could but felt so awkward for 15 minutes.
All in all nothing to cause PTSD exactly but in an ideal world incontinence would be as embarrassing as having a broken arm or diabetes, not at all in other words