Breathing out through your nose produces far fewer droplets than speaking. Of course breathing in without the mask over the nose means you effectively have no mask. My criteria is pretty simple: if you want to be inside in a crowd and talk, then wear one to trap outgoing droplets. If you feel you are perfectly healthy with zero chance of being infected, then don't, but don't talk. Just breathe through your nose and keep quiet.
or you just wear your mask and hide under your bed and leave the rest of us alone
“then wear one to trap outgoing droplets.”
The droplets that contain a virus are more than small enough to go right through that silly mask.