Someone who thinks everyone should wear a mask at all times, with no exceptions. You can't even eat or drink around a mask nazi, they will flip the fuck out if you do. They confront those who are not wearing masks (even if masks aren't required). Masks Nazis will harass, sometimes even attack those not wearing masks.
Mask Nazi: You must wear a mask at all times! No exceptions! No eating or drinking allowed because that requires the mask to be taken off!
Everyone else: Ok Mask Nazi!
A condition of hopeless respiratory Pandemic unpreparedness has required many people, even healthcare workers, to continuously re-use otherwise disposable Personal Protective Equipment. Unfortunately, the INNER surface of protective face masks have a tendency to become heavily soiled by saliva, sputum, food particles, nasal secretions and other decomposing bio-active materials.
Oh, man. I've been wearin' this N95 for two weeks now and I just can't stand it!
Dude, you got the Mask Stank! Just turn it inside out...that's what you do with your underwear. Right?