I often used to take my mile walk at a local large (outdoor) shopping center. (most of them are outdoor, not inside buildings, in southern California)
About a year ago I noticed Asian people wearing masks while the rest of us didn't. At first I felt sorry for them thinking that they were ill or immune compromised and needed to protect themselves. In a month or two I changed my feelings about this and thought they were smart to wear masks and a month or two after that I too was wearing a mask when I took that walk there.
However, I haven't even thought of walking there since October -- too many people. I now walk in my quiet, suburban neighborhood where there are few cars and when other people approach me, on their own walks, I simply move out into the road so that we can pass safely.