Why should I make myself uncomfortable, when so many can't even be bothered to wear a face covering to begin with. At this point, I'm watching out for my own safety.
So this would be an argument against wearing a mask in public, since these masks, if the vent is uncovered, allow unfiltered air to escape. It defeats the purpose of wearing a mask. And in San Francisco, apparently it would be against the health department's orders.
Health Department says:
As a result, these masks are not a face covering under this order and must not be used to comply with this order’s requirements,” said the health order, signed by Dr. Tomás Aragón, the health officer for San Francisco.
The vents allow unfiltered exhaled air to escape.
If you don’t cover the vents, that defeats the point of wearing a mask, which is to keep potentially infectious oral droplets from spraying outward to other people.