In Sri Lanka, some people who are highly concerned about hygiene have developed the skill of pouring liquid from a container straight into their mouths without their lips touching it. Sometimes people do this even if they are served in a glass, because they fear that the rim of the glass may be unclean. I would not be surprised if this practice has its roots in the odious caste system that said that touching anything touched by supposedly ‘low caste’ people made you unclean.
But I have observed the other extreme many times in films and on TV in the US. Someone opens the refrigerator in a home, takes out a carton or bottle of milk or juice, and then drinks straight from it, putting their lips to the mouth of the container. This is even when the people live in a home they share with family members who presumably use the same container. This strikes me as pretty gross. But I have seen it so many times that I think it must be more common that I would have expected.
Is that the case?