I see wearing a mask in a similar light to washing my hands. It is possible to be a carrier of an infection without having any symptoms yourself, and it doesn't hurt to wear a mask in certain spaces such as crowded streets, hospitals, shops, and public transportation where there are a lot of people. There could be people around me who are immunocompromised, and if wearing a mask will help prevent others from getting sick, that makes it all worthwhile! It's a small thing that can go a long way!
This is a very common thing outside the bubble that is the US. In fact, before COVID it was totally normal to see people wearing masks when they were sick in public places. A little strange to see, but still normal and nobody really cared. People didn't give two shits back then versus now where they stick out like a sore thumb. Before you'd see someone wearing a mask and think "oh, they might be sick" and move on with your life before you even had a chance to put it into your long term memory. It's not that it's weird to wear a mask. It's that everyone forgot that it used to not be weird at all. The fact that they are getting judged in the first place would seem completely ridiculous 5 years ago.