If you go watch surgeries, you’ll see blood many times squirts all over hell. Maybe you also don’t feel like eating blood of a stranger ... just a thought. There are lots of good reasons surgeons wear masks that have nothing to do with airborne viruses.

They're not wearing them in the OR to prevent the transmission of airborne viruses. If that level of protection is required they're in full body suits. Whether it's to protect them or the patient.

Bacterial infection maybe??? Orders of magnitude larger than a 140nm virus.

Three reasons surgeons wear masks right off the top of my head

A. Because they are cutting people open and exposing their innards to pathogens

B. They work in a hospital that provides proper masks

C. These proper masks are properly sterilized after every use- usually worn for an hour or two tops before they are tossed in the wash bin.