This applies if you’re coating, say, a plate in resin and then eating off of it, but the UV resin only coats the outside of the tumbler where you’re holding it with your hands, there is none on the inside where your beverage is held. So not an issue for food safety in this case! 😊
This tumbler (like most tumblers) has a plastic lid with a rim, so even without using a straw, there is never any contact between the lips and the resin. 😊