FWIW I live in Amsterdam (also western Europe) and anyone in the streets under 50 is wearing them, myself included.
> They keep them in while ordering and paying for things in stores and supermarkets.
As a GenYer I find this rude and I'll take them out any time I interact with someone.
My point being that their ubiquity doesn't have to mean people being rude or indifferent to eachother.
I think people have the right to choose comfort and focus, anywhere outside of a conversation with another person.