I wanted to but was afraid it would make me look like weird.
I used public transport a lot last year (buses often packed full of filthy school children) and generally - and especially when I had a race coming up - I would be quite concerned with trying to avoid their germs. I had a race on the 15th of March and in the couple of weeks preceeding it I actually did occasionally cover my face with a scarf when on the bus when it was particularly crowded and there were people coughing. Not to avoid covid, as such, just illness in general.
My housemate also had an infectious stomach bug that he picked up doing a paediatric rotation; it had passed round amongst other students and two of the students I was with on my placement were also ill with colds/flus/possible covid at the time (one of them came in and told me 'I'm so ill').
I felt like I was surrounded by illness and no one cared about spreading it. I did, in fact, get a little ill before my race but it didn't stop me from getting a PR.
I'm glad now that masks are now seen as acceptable, and people are more aware of trying not to spread disease. It would be great, in my opinion, if we adopt the Eastern attitude of wearing masks when we have respiratory illness so as to reduce spreading it to other people.