So in brief - one of my relatives has simply appalling manners, in general, and there is no other way to describe it. By which I mean:
- shovelling food into his mouth
- downing drinks in one go
- licking knives
- no sense of politeness, especially in public. Eg. instead of saying "I'm just going to the loo", would say, "I need a p*"
- swearing around children
- burping and farting in public, wafting/smelling farts
- breaking wind in overblown ways for 'comic' effect (eg. trying to burp tunes)
- absolutely no filter, eg. would be walking around town and just announce "my b* are itching" or similar
- loudly complaining about everything if eating out ("food is dry, don't like the sauce, bread's too hard, crap for the price, could make better myself")
This behaviour has basically been lifelong and despite reprimanding him for years and years, it has never changed. Even saying, "You are embarrassing me" or, "that's disgusting" has no effect. He doesn't care that he's in public or who might see or hear, not interested.
It has come to a stage where I am avoiding introducing people (eg. partners) to him and avoiding meeting him in public / inviting him to things because it's just mortifying. If you get angry about anything he says "What, what? You're making a big deal out of nothing." Is there any way to 'train' him to stop being like this?