There were three stages in U.S. government statements about masks (stage 1) they do not help you (stage 2) they help others, but not you (stage 3) they help you and hope others.
- It is possible the person saying they wear the mask for others never heard the stage 3 information, or heard it but disbelieved it.
I personally thought stage 2 was very strange. How was it masks could prevent aerosols leaving my mask but not entering it. Eventually someone opined that it prevented large drops if I sneezed which helped others, but neither their mask nor mine stopped all aerosols. (That is what I now believe, and yes, I wore a mask before vaccination and still wear it so as not to scare anyone.)
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