I find it very funny when someone refuses to drink directly from a glass because they aren’t sure it’s clean. What the flip do they think about the utensils they’re putting in their mouths? How about the plate? AND, if the glass isn’t clean, the contents are being contaminated anyway
When I was a server I waited on many who asked for a straw with every drink, even water, and were perplexed and insulted when a straw wasn’t automatically given. Many of these people also requested a glass of hot water with which they sanitized their utensils.