I also dislike the lack of mugs in coffee shops. Big chains don't have them at all, and local shops you need to specifically ask for it or they assume a paper cup.

I'm often the only person drinking out of a mug in a coffee shop full of people.

But I'm a grumpy old man that doesn't understand today's world, and I accept that. Leaving work to drive to Starbucks and buy a coffee (instead of using the kuerig or espresso machine in the break room) is gen z's version of stepping out for a smoke break.