surely there is no point in that common courtesy. Of course you would prefer that those sneezing in your presence cover their mouths/noses! Additionally, you should stop conflating cloth masks with (k)n95s as those can prevent the transmission of vaporized particles for several hours or longer if both the infected and the healthy are wearing them. My son sits on the bus next to a kid who currently has coronavirus, and so far he has not had any symptoms. Both kids wear masks on the bus!