That’s a nice phrase. In my group we called it “dick-nosing” - iirc it came about due to:

1) you wouldn’t (shouldn’t?) go around with your dick hanging out of your trousers, so why would you do the same with your nose and your mask

2) you’re a dick if you do this

A decent amount of it is unintentional I suspect. Subconcious fiddling, poor feeling / awareness of slipping masks... a gentle reminder that "your mask has slipped a bit" can do wonders.

Similarly, a gentle reminder when one's dick accidentally slips out of one's trousers is also appreciated.

Too rarely does good, cutting satire grace HN.

Some responses to that will be (in the spirit of) coughing in the speaker's face.

So far nobody's coughed in my face, in spirit or otherwise.

Seen a guy on the street taking off mask to do giant sneeze, put it back on afterwards promptly. His wife facepalmed. To his defence he’d probably have to wear juicy mask if he didn’t do it.

My interpretation is that this is referring to those individuals who are wearing a surgical type mask, with the top of the mask resting on their upper lip and their nose not covered by the mask.

Yes. I get the impression that often they simply don't know how to put these masks on -- you need to pull them apart somewhat so they extend from the nose bridge to the chin. If you don't know that's how they're fitted, you'll end up with either of the nose or bottom of the mouth uncovered.