DH's observation on masks after a trip to Asda was the people mostly don't wear them properly, adjust them constantly, and think their magic mask of immunity means they don't have to social distance or do the other stuff like washing your hands.
I tend to agree.
When I go back to my voluntary position in a charity shop I will NOT be challenging people over mask wearing. They nay have a very genuine reason for not doing it and even if they don't, I'm not the police and it's none of my beeswax.
The people who were constantly ringing 111 to report their neighbour for "flouting the roolz" will be LOVING IT though.