I have always had issues with significant others on this. It’s one thing for me to choose not to share drinks. It’s another when your date shares a glass with someone then kisses you. I find this intolerable. Not many people can relate. Choosing not to share drinks is like spraying L on the kitchen countertops after cooking: plenty of folks don’t care. They never got sick from making a sandwich on the same surface they used to cut salami a day ago, or at least they didn’t realize the connection if they did. To them, you’re the obsessive compulsive clean freak. So maybe when you’re not looking, they’ll keep doing it. You angst that eventually you will both die of food poisoning.
For the record, I stopped drinking after my mother around age thirteen. I am a freak. So there.