But why is it a problem if someone's wearing a mask alone in their car? It doesn't affect you at all. Your opinions on the matter are just unsolicited noise.
That being said, there are many situations where it still makes sense:
- Feeling sick and on your way to pick up someone else
- Just dropped someone off and haven't taken it off yet
- It's not easy to take on and off so you just leave it on
- You're only driving for a minute and will need it when you get out.
So they're still wrong, but I see why they said it.