Truly rich people, especially those who've always had money, tend never to discuss how much they've got, or what they've got, because it's no big deal to them. They're used to it. No one would brag about having, say, a toilet - because we all have one and are used to it- so it's similar to that
And rich people usually play down how much money they have, because besides being seen as vulgar discussing personal finances, most truly rich people are incredibly shrewd and don't like people asking them for loans.
And truly rich people are often quite mean with their money, and will even pretend they have much less.
They love a bargain too! They'll also find ways to "hide" how much they've really got, and consult specialists to find out how to pay the least amount of income tax as possible
Truly rich people are notoriously bad tippers, too...
They never flaunt their wealth; they do the opposite because they don't want to lose it by attracting hangers-on and people asking them for loans
Truly rich people who are nice never show off to those with much less than them; they find it embarrassing because they understand it could make the less well-off person feel dissatisfied
An extreme example would be: visiting a third world country where people are starving and begging on the streets for food, and sitting in front of them gorging on a huge juicy steak. You just wouldn't do it, would you...
All braggers are inadequate in some way, and they all exaggerate 