I'm afraid that DH's increasingly bad manners were one of the factors in our separation 
I swear they weren't so bad before we got married, because I wouldn't have married him!
Whether eating at the table or in the sitting room, his face would be so close to his plate that there was barely a fist's distance between the two. This was to enable the shovelling in of food, especially before he'd finished the previous mouthful. He would frequently start a long-winded monologue while he was chewing as well.
If at table he thought nothing of stretching his arm across my plate to grab something (and did in fact get a fork in the arm once, entirely by accident). He once made such a fuss about ds1's portion of crackling versus his own that I nicknamed it 'CracklingGate' and told everyone, in the hope that he would feel ashamed- but it didn't.
He would also pick spots on his legs in the sitting room, grate off the hard skin on his heels, fart... many unsociable things.
And almost worst of all- he would remove his trousers when he got in, and wouldn't put them back on even if we had visitors. All my friends have seen him in his pants- and his sleep shorts. They all have a special name for him...
So yes. Bad manners do turn me off 
The sad thing is, I brought these issues up -in a neutral and gentle way, obviously- several times, even saying that I didn't find them sexy and a turn on, quite the opposite in fact- but it wasn't enough to make him change.