I think it's mostly perceived stigma (or self-stigma) rather than actual stigma from others, and partially a generational thing where there was more stigma in the past. Attitudes to sight correcting glasses have also massively changed in the last few decades.
That's because in the 70s only 25% of the population wore glasses but now 80% of people need to wear them (or contacts). What's the point of making fun of someone who needs glasses when the majority of people around you are in the same boat.
hearing aids are kinda lame. they fix deficiency whereas cool things usually raise normal baselines.
again, a lot of old people wear them and young people often reject old people things reflexively, regardless if it's beneficial or not.
I only have experience proslethyzing, I have little understand of who has fallen.