I saw someone driving alone in their car wearing a mask two days ago. I live in Kansas.
Otherwise, I do find that weird and I am an ardent masker. Actually, come to think of it, the other day I drove home that way because I just forgot to take it off when I left the supermarket.
So there are non-weird explanations. I doubt they account for all the cases.
I've got a neighbor who wears a mask to move his trash can the 20 feet from the inside of his garage to the pavement just outside. He also wears the mask when driving alone in his car.
COVID definitely broke some brains.
Sometimes I forget the hat or the mask and then I just wear one.
They could have forgotten it when they got in the vehicle from their last destination.
There may be a kid in the back seat you couldn't see that they are trying to protect (or protect themselves from).
I personally don't understand why this is remarkable. In no way are they hurting or affecting you. Why does it matter to you if they mask?
It makes sense to wear a mask when you’re on an airplane or if you’re a service worker in constant contact with the general public.
Now for me personally wearing a mask was almost impossible to ignore because I wear glasses, so my glasses were constantly fogging up and it was a huge hassle and nearly unbearable over the course of a day, so in my mind it’s extra surprising to see people wearing masks when they’re alone and in my mind it doesn’t make much logical sense to do so.