Reading you reminded me of my grandmother, she was extremely scrupulous in the kitchen and would not eat dishes from just anyone, and since I remember, she taught us the custom that everyone should have their own cup, because she thought it was disgusting that everyone stuck their mouths in the same glasses, and so to this day everyone at home has their own cup and does not share it with others or with guests.

As for coffee alone or with company, sometimes it is nice to have coffee with someone, either in their home or ours, maybe in a coffee shop and talk, but like you I am happy, having my coffee alone, thinking, reflecting or watching the landscape through my window.