Why do they wear their mask under their chin?

[SueDonim]

I don't see it quite so much these days being post pandemic but I still see it now and then. So why do they do it? 

I was of the understanding that the mask was to keep the nasties from going up your nose or in your mouth, but wearing it under the chin is not going to stop anything. So why bother? What's the use? There's no point to that at all. It's just ridiculous.

My first thought, like others above, was "because they are stupid". I suspect it is for the ability to pull it up "when needed" but they are totally missing that by the time they do the quick pull up, either the mask or their hands or both are likely to be contaminated and touching the mask is about as risky as touching your face when you have no mask.

For a mask to be effective, you should put it before going out into the dangerous space, then leave it alone and don't touch it until you are taking it off with freshly sanitised hands. Then it has some chance of being effective. If I have to touch or adjust mine while it's on, I do gel my hands first, then again before touching anything else.

I now rarely wear a mask for low volume retail spaces, but definitely still do for the supermarket or any kind of health care setting. It's simple, I don't like being sick.