This whole thing grosses me out I guess I'm sort of a germaphobic. I have a fit when someone here in the house even eats chips out of the big bag. I want them to dump them on a paper plate or plastic cool whip bowl or something.

If I ever thought someone in the house was drinking out of the milk or juice carton, etc, I would probably pack up and leave. DH and both DS's are even funny about sharing food with the rest of the family if it has already hit the dinner plates.