They go hang out in incredibly expensive country clubs and on their yachts and at elite universities and prep schools, polo camps and air conditioned safaris.

This is the function of exclusive social or networking events. Often either an exclusive invite list or very high plate price. You’re either invited to the table, or pay to be there.

Once you’re at the event, you’re either known, or engage in small talk where details are revealed. Here strategic partnerships form, or there are quid pro quo for access to secondary or tertiary networks.

It’s not what you know; it’s who you know.

Wealthy people don't mingle with the rest of us. They literally live in a totally different world, and you ain't invited unless you can clean their toilets for cheap, or give them massages on their private Caribbean islands and shut your trap.

only wanted to be friends with other wealthy people

Never go out to public places. Never go alone anywhere. Meet people mostly at private places with invitations, or maybe for example at charity events where you pay 5 figures just to get inside.

and wanted their kids to only date and marry people from other wealthy families?

Have your kids at private schools and the most expensive universities.

They meet up on Epstien's island.

People generally hang out with other people of their general socioeconomic class, so it doesn't take much guesswork. Usually, they just have nothing in common with poorer people (not the literal poors, upper middle class is poor to them), don't go to the same places that poorer people go to, and unfortunately, poorer people generally tend to be less attractive than rich people due to lack of access to cosmetic care. The cosmetic care includes skincare, dental work, and I've even seen growth hormones as soon as elementary school.

One last point, multimillionaire and billionaire circles are extremely small because, as you can imagine, there's not that many of them! They tend to know way too much about each other, so if you do happen to be poorer and run in their circles, they'll either know and/or you're smart enough to be playing their game.

codewords like "skiing"

For the online side of things, there are actually social platforms designed specifically for wealthy people. For instance, there's Raya, which is an invite-only dating app that only allows celebrities as members. The platform was kept "secret" by making it accessible only through an iPhone app, whose description in the App Store was intentionally vague and boring, to discourage any plebs from bothering to install it. Raya is just one of many secret "elite" social platforms that most of us have never even heard of. The wealthy live in a completely different reality from us.

usually at expensive events which are privates, like price per plate stuff.

They sniff each other’s butts

There are all sorts of filters:

• Expensive clubs. Members only associations like country clubs can skew towards the ultra rich. Yacht clubs and polo clubs are kinda an extreme version of this, but there are all sorts of organizations where the membership can be assumed to be rich.
• Expensive hobbies. Wine tasting, skiing, golfing, boating, horse stuff, biking, and traveling/vacations can range from the slightly expensive to prices that only the ultra rich can afford.
• Related to both of the above, expensive places. If you're skiing in an expensive resort town, and hanging out in the lobby of a $2000/night hotel, you'll probably only see employees of these places or other very rich people. Some have even layers beyond that, like an exclusive members only club in an expensive area, or a separate lounge for only people lodging in the most expensive rooms in the hotel. Or if you're at a private jet airport, and weather causes delays and cancellations, standing around in the terminal might allow you to mingle with other private jet people. Or if you live in a crazy expensive neighborhood or building, your neighbors are pretty much guaranteed to be rich.
• Third party verification. Networking, introduction by mutual friends/acquaintances, even social media or dating apps where you have to prove your status/wealth.

It's not all or nothing, either. Some places have a disproportionately high number of rich people but aren't necessarily exclusive to the rich (private schools, certain types of clubs, certain types of activities/hobbies, public parks/restaurants/libraries/museums in rich areas). So a lot of rich people do mingle with the middle class, but often will feel comfortable letting their guard down more or less in particular places or in particular groups.

Rich people arent even connected to people who arent rich. Its their entire ecosystem. Everyone has money, thats just how it is. They dont talk about money because they just have it. Its like air.

If we're not talking about the super rich, because there is only a few dozen of them, and they have their own parallel universe... it's usually mannerisms, language clues (in articulation and content), but of course also signals like expensive clothing and accessories. Also the places where they meet. This opens the door for all kinds of grifters who emulate behaviour and style to get into those circles. Jeffrey Epstein is an (in)famous example for this.

Exclusive or elitist events, activities, education. Also how people dress and hold themselves is often a good indicator (most refer to this as class). The obvious question of what do u do is very effective at filtering out the low lives. Also networks and who you know is the real value in the inheritance not the money or assets. From a young age your taught to network and figure these things out without being too explicit and to find the people that will be successful before they are successful and if they are playing a similar game it snowballs from there.

There's an app called 'Rich Kids'

It requires $1,000.00/month fee. People use it just so they can communicate with other rich folks.

If there is a speck of avocado toast on your shirt they know that you are part of the club.

They don't. they are people jus like anyone else. They hang out with people who are genuine and figure out who isn't fast. They have limited numbers of people they want as friends just like the rest of us (you run out of time to spend with them if there are too many).

The genuine is why they hang out with only rich. A few are not and they seek out the rich and famious, so as protection the rich hide. too many people make real death (rape, kidnapping...) threats to risk being easy to find.

but in the end they are humans just like the rest of us seeking genuine friendship.