I think I know a ton of Covid-cautious people who "wear a mask" to restaurants by putting one on as they walk through the door and taking it off as they sit at

I think I know a ton of Covid-cautious people who "wear a mask" to restaurants by putting one on as they walk through the door and taking it off as they sit at their table. There are a lot of contexts where masks directly affect transmission, but it seems clear that they're also serving a symbolic role beyond their practical utility.