Face Mask Etiquette Questions

From July 16, 2020

Hey Liza,
We went to a place to get coffee and a bagel and we wore face masks. Most of the people in the restaurant had them on too. Then I saw a woman get her food, sit down at a table, take off her mask and put it on the table. That seems pretty gross to me. What do you think the face mask etiquette should be?