I've not berated anyone for wearing a mask or not wearing a mask at any point. But considering consequences when deciding on the reaction level isn't "fluid ethics" as was stated, and it was in fact disingenous horseshit. If someone is going 15mph over the speed limit in my residential neighborhood where kids are playing, I might in fact get their attention to slow the fuck down, and then actually drive 15mph over the speed limit on a wide-open interstate in good conditions. That's not hypocritical or "fluid ethics", that is just considering all circumstances in evaluating behavior.
Just like Serak correctly points out, if I wear a mask around you it literally harms you not an iota. People not wearing masks around others do negatively impact others, as masks do in fact reduce the spread, even if not as much as would be hoped for. But even a 0.5% reduction does add up when you're dealing with large numbers. If I'm an immunocompromised cashier who processes 4,000 people a week, yes if all of those people wear masks it will make a not insignificant impact on my risk level, especially over even longer periods of time.