Masks have become a very personal thing.
Interestingly although there is no longer any requirement to ware a mask in HK at least 80% of the population still do and I suspect that many will continue to do so as in Japan where masks have been warn as a norm in the flu season and when one has a cold - this so of course so as not to infect others. This is not a recent happening as the Japanese have been waring masks since at least the mis forties.