Obviously you have not yet learned the great skill of "tuning out" people and this is your chance to practice it because in your life, you're going to have to use that skill a lot. Some older people develop certain things due to physical changes they cannot control--teeth problems and all that. My old dad not only smack and sprays when he talks, you still can't understand him because he's not able to enunciate well anymore, and his gums are receding so he's always picking at his teeth. He has some sort of swallowing problem so spits out part of his food and coughs out some of his food. It really grosses out my mom who has to see him all the time doing this (plus she already was pretty bitter toward old dad and this is just aggravating her more) so she's going to a support group to work it out. I personally can just close it all off and not be bothered by it, find it kind of endearing somehow (because last summer he virtually stopped eating altogether, lost about 50 pounds, was unable to even stand up or get out of bed, and looked like he was dying which he was since he wasn't eating enough to keep going). I love the old guy so if he has to make noises (and he is aware of it, sheepishly apologizes) and all that just to eat, that's ok by me. I'm not selfish enough nor inflexible to allow for some give and take. If you find you simply cannot allow some grace for your grandfather's eating habits, talk to your grandmother. Maybe she'll allow you to either eat alone before them, or after they are finished eating, or maybe take your meals in your room instead. But ear buds would be inappropriate (however, they do make ear plugs usually for swimming that you could probably use as long as you know when someone is addressing you directly--again, ask your grandmother if she'd find that offensive at her table).