WHERE did you come up with THAT idiotic idea?? Masks have always been "bifunctional". The doctors and nurses in an operating room certainly don't wear masks to protect themselves from the patient.
Masks are actually MORE effective at "carrier to victim" protection than the reverse, because the blocking action happens while the bioaerosols are largest, before evaporation reduces particle size.
Masks are signals of social submission. they protect no one but they certainly give the smugly self righteous a warm tingly feeling