My older brother is a kind of mentally challenge... well, he is normal but sort of an idiot. And he is so noisy and when he is eating I do not know how he makes so much noise out of everything, dishes, chewing, swaloing and so on.
He got marry and his wife eat well but is even noisier than him, that sort of people that has a loud voice and everything is loud that even my brother tells her to keep it quiet.
But the noisiest and disgusting people ever was when I was an exchange student in arkansas. The entire town was horrible at the table, even the cheerleaders eat like pigs. No wonder all the exchange students ended up together.