As an adult on the spectrum, I actually find myself reaching for ear plugs and tinted glasses increasingly often as I get older, even though I should have been "desensitized" by all measures. Sure, I know can spend a ton of energy trying to pretend like I'm not bothered by a noisy environment - but it's just not worth it any more. I don't really care if I look goofy, I'd rather have my mental well-being preserved later on.
I feel like we're taught that that our options are to just deal with and be very uncomfortable at every restaurant, movie, or otherwise loud public space, or avoid those settings altogether rather than make other people feel slight unease from seeing a person in public with earplugs or tinted glasses. I realize now it's not really a big deal to wear those things in public, and it's much easier for the people around me to get over a slightly silly-looking accessory than it is for me to "get over" sensory overstimulation.