I'm reading "Witness" by Whittaker Chambers, which was written in 1952 about the Alger Hiss (communist in the US State Department)trial. It's very well written, and very interesting. I thought it was particularly cute, when he was telling about certain rules his mother had with respect to manners:
" A man of 'breeding' is known not so much by what he does as by what he will not do.
1. First and foremost, he never imputes a base motive to anyone else.
2. If someone is rude to him, he assumes that the rudeness is unintentional. If he knows that it is intentional, he acts as if it were not.
3. He never meets anger with anger.
4. He never patronizes anyone because he never assumes that he knows more than anyone else or that uneducated people are unintelligent.
5. He never corrects other people's slips. Always allow people the luxury of being mistaken. They will find out for themselves soon enough. If they don't, they are the kind of people in whom it does not matter.
6. Never, under any circumstances, eat in public in front of people who are not eating."
BTW, Chamber was born in 1901 if that helps :>D