The issue of mask-wearing is complex. I do my best to wear one when in crowds, but I do seriously consider the viewpoints of those who don't. That way, instead of being angry at those people, I can acknowledge that they have some valid perspectives, even if their decisions differ from mine.
Here are some of the perspectives I've heard from those who choose not to wear masks:
~ When COVID first appeared, we were told repeatedly that masks don't help. There are still no strong scientific studies confirming that masks do help. What does help? Social distancing, frequent hand-washing, and isolation of those who have been or may have been infected. The CDC website even says that "the cloth face cover is not a substitute for social distancing."
~ During the SARS outbreak years ago, we all saw pictures of mask-wearing people in affected countries. These articles contained prominent statements advising everyone that masks don't prevent the spread of disease at all; they just make people relax and feel better about going out.
~ Many people have issues with asthma or a mental health issue, and cannot wear masks, period. You cannot tell whether someone has a breathing problem or mental health issue by how fit or "normal" they appear to be. (Note: I personally have asthma and have to remove my mask immediately if I sense that my levels are dropping).
~ People who do wear face coverings are constantly touching them. By doing this, they are picking up all the germs they've breathed out into the mask. Then they are touching everything in the store or other public place, and then touching their faces again to adjust the mask. Thus, it is quite possible that more germs are being transmitted by mask wearing, than by going without masks.
~ Social isolation has a proven negative effect on one's immune system and overall health, and masks exacerbate the isolation.
Again, I am not saying that I agree with all of these points. However, if we seek to understand why someone may think or behave differently than we do, it helps us not be angry, upset, or anxious towards them - all of which emotions are also bad for our immune systems.