Depends what you mean by “crazy”, I suppose.
Specifically DID? No one in my family I know of.
I have a laundry list of mental health issues, so I might qualify.
But the only person in my family who has been institutionalized was my one cousin. I think he was getting violent before they got his meds right.
This has how it’s always been used as far as I have seen as an older millennial, aside from being used in a form of irony.
It’s an upbeat tone indicator. But it’s not the same as sending someone a smile with your text.
It fills a useful niche. Just like /s also does.