I don't think I've ever seen someone with a hearing aid and though anything negative of it, I get it people can be self-conscious, but for something like a hearing aid I think it's unjustified.
On the other hand, I can't bring myself to keep earbuds (airpods or w/e) in my ears while talking to someone, regardless of if I can hear them properly, I just seems incredibly rude.
My uneducated opinion, is that someone using airpods as hearing aids is more likely to face stigma for that reason, than someone wearing what are clearly hearing aids, unless people actually know they have hearing issues.