May this be the absolutely WORST problem facing Klal Yisroel today!!!! Not to minimize what you said, though, because poor table manners are really disgusting. I did not follow through on a shidduch for a friend, because when I chanced to observe the young man, his manners were worse than atrocious, and I knew the girl would be offended to be set up with him, as she is very eidel. And how do you tell someone something like that, without hurting his feelings? It took him all his life to learn to eat like a bulvan. Either he has no idea of how he looks to other people, or he does not care. Either way, it is a VERY touchy problem. But it is also disgusting to hear loud smacking noises, and/or see food being chewed in an open mouth.
