Both my grandmother and my mother had been at convent schools so they were both taught particular forms of social manners which were very of their time - and they were both keen on teaching me! 😂 My grandmother’s version was a rather fussy kind of lower middle class pre-war manners, and my mother’s a sort of postwar middle middle class version, so they sometimes contradicted which was a bit confusing… My grandmother was big on things like saying grace, pardon, lots of rather coy euphemisms for things regarded as slightly shocking, doilies, crinkling your little finger when holding a teacup and so on! My mother was not bothered about that kind of stuff, but was very strict about things like being polite to adults, knowing how to greet people, never interrupting her when she was having a conversation with another adult, table manners, saying “thank you for having me”, addressing all adults as Mr or Mrs etc.
In case you’re wondering — no, my grandfather or father did not get involved in the teaching of any social niceties or behaviour (!)
I also remember that it was also not always just parents, but for example Brownies, where you had to do eg the Hostess badge all about manners, greeting a guest and serving tea and so on. The Brownie Guide Handbook was very big on 1950s manners for children well up to the end of the century!
Interestingly as an adult I ended up working in an industry with a lot of very upper-middle and lower-upper class people, and then had to learn a whole new set of Mitford-style “U” manners and conventions. I end up code-switching between them though, depending on who I’m talking to and where I am! But I does help for the old confidence to be able to meet some genuine poshos and still know what to say 😂
Or to be at a formal dinner and not worry that you’re getting things wrong. (My top tip! A genuine posho often does not know what they are doing either at a formal dinner or event, but instead they just loudly say “I have no idea which fork to use! Someone must tell me! Do YOU know?”, all with total unembarrassment.)
So much of manners was and still is (though to a lesser extent thankfully) about social class. Some of it is about being polite and putting others at ease. Some of it is also about class codes. Thankfully that aspect is fading a bit now — those silly etiquette columns in papers like the Mail where they get some toff to explain that it’s “napkin not serviette” now look really daft, and rightly so. So I would not worry about learning social niceties. Just watch other people and then do what seems to you to be considerate and polite and then don’t worry about it.