> you're imposing your estimates of safety on others, who may wish to avoid having to pass people who aren't wearing masks, even outdoors

This is precisely the insufferable safety-ism that characterizes the 21st century.

If you feel particularly at risk in the case of infection, and you'd wish to avoid infection - stay inside and isolate.

Isn't completely fair to say that the frail among us are imposing on everyone else outdoors keeping healthy and not depressed by exercising, etc?

If you "may wish to avoid having to pass people who aren't wearing masks": stay home!