People talk about 'old money'. I grew up in a village with a Lord of the Manor. He did enormous good for the people locally. He served in both World Wars and was highly decorated for bravery. When he died his daughter had to sell the Manor house, where many other people who had difficulties lived, to pay death duties.
She maintained her father's good works. For example she sent my grandfather and granny on a convalescent holiday every so often because his lungs were damaged in WW1. It is a pretty village and house prices soon were out of reach of local young people so they had to leave. She tried to re-establish an old industry so there was employment and built houses for local people only. She herself lived so frugally it was almost uninhabitable where she lived with leaking roofs and old wiring. But she put her duty to local people first. The nouveau riche arrivals opposed her attempts to bring work and a reliable income to the young local people. They even opposed her plans for establishing a health centre because transport to the nearest town was dire and the old people especially were suffering from lack of health care.
My dad was from an old farming family and had close ties with her. Her had hit rock bottom but was too proud to take any government benefits. He always told told me to 'judge a man by his deeds'. Obviously he meant women too but he was born in 1910. In the village I saw many rich people from 'old' families who were generous, hard-working, and their children all had jobs. I saw many 'nouveau riche' who put on airs and graces and the women then just lounged around in make-up making the people born in the village do their housework. I also saw young people who took drugs and didn't work.
Rich people are not all the same. The ones from 'old families' who were land-owners where I grew up were good and cared about the everybody in the place where they lived. Obviously there must be some who were not good, but luckily I did not meet them. The only people who thought they were too 'posh' to be polite to someone like my dad were those jumped-up newly wealthy people with no values and no respect. We used to laugh at them. Except when they got ponies and did not look after them properly.
"By their deeds shall ye know them". This probably comes from Matthew chapter 7 where "deeds" is explained as the "fruits" of what people do. No matter what they look like or say, you'll know if they are good by the results of what they do.
King James Version: Matthew 7
15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20 Wherefore by their fruits ye shall know them.