It's because of mental conditioning. Think about it. You know logically there is nothing wrong with wearing diapers and you have a psychological need for them. Our culture has an "Eww, gross" attitude about diapers because of the inherit nature of them being used for incontinence. You have picked up that attitude along the way and accepted it. I've discovered as I became a 24/7 ABDL that eventually (as in fairly recently) that my feelings have FINALLY changed and I see this part of me in a positive light. I'm not as irritable and my hair trigger anger seems to be easing up. I'm calmer and happier and what's more, I feel like myself when out and about. I don't feel like I'm wearing a disguise anymore, which is how I've felt for basically my whole life.
I see this not as some bedroom kink but as something much larger and encompassing. Because it's more of an identity thing for me and feeling comfortable in how I dress. I know it's not mainstream and to be honest, I kind of like that fact. It makes me unique in a good way. I realized this hurts nobody and if anyone finds out about now? I've got the tools and calm head to handle it. It's only weird because of it being unfamiliar. Diapers are my underwear and the humiliation and shame are baseless.
I find that diaper jokes don't turn me red in the face anymore. I accept how it looks to outsiders and understand the joking. So I say, yes. I do know what it looks like. Do you know what it FEELS like? Because it feels amazing.
All in all I've been made a better more tolerant person because of this.