I understand. My grandma used to taught us no talking at the dining table.I was brought up from 2 or 3 to eat with my mouth closed and in my nan's words "not to make disgusting noises", so I said I'm not inviting him because he eats with his mouth open... better than not inviting someone because they are female/male/attractive/unattractive I would have thought... I have had table manners drilled into me from a very young age that's all
Same here. I have a cousin, and everytime he ate, it was like he want to make sure the whole village know he was eating.. Quite annoying.I know how you feel, i hate that sound and whenever I am around people that make sounds like that it just makes me zero in on it and drives me nuts. I don't want to be rude but sometimes it gets to a point where I just say please don't eat like that.
If that doesn't work I will just leave for a bit and start fresh a couple minutes later.
I never knew people had to train themselves how they are supposed to chew food. I never notice how people chew, whether their mouth is open or not I never put any attention on it. It is probably the person who complains about it the one who really has the issues. I had someone make comments about my eating one time (eat too fast, take too big of a bite, noise etc), and I found that extremely rude and along the lines of deserving of a punch to the face. Funny thing is, that same person who complained makes noise when they eat. So some people can be a bit hypocritical. Again, not the eater but the person who brings it up is the problem.
It's not "train themselve." It's raising, parenting, upbringing... From your post(s), you seem lack of it...
This seems like a good ideaI don't really understand people tearing the op apart. what she described is much more than just eating with mouth open "....eating with mouth wide open, incredibly loudly, getting food everywhere and talking with mouth full" ?.
Mouth so wide open that food is spewing out everywhere, and talking away? yuck. It's the picture of a pig at the trough.
If a picture is worth a thousand words, then perhaps seeing video of himself (along with his sounds) eating at a table with other people might be kind of a shock into self-awareness. Just like snorers have no clue until they hear themselves recorded... or when someone sees themselves in a group photo & all of a sudden they realize they've put on lots more weight than they realized? They're like "OMG do I really look like that?!" then they go on a diet, Lol.
Of course have the video shoot for another reason or "occasion", & don't shame him about it. but sounds like talking with him is important for you and the relationship.
Seeing the contrast between himself & others could be a whole new perspective for him.
?.
My great grandson (less than 3 yrs old) has more self-consciousness that what the op described.

