I remember an article about those trickle down behaviors I read recently.

Sounds like Rob Henderson's writings on luxury beliefs.

Where the upper classes play with things like gender, fluidity, polyamory etc. and it becomes their signifiers (which lower classes copy and that has disastrous consequences for society at large) but the kids who played with those things return back to Olympus get married have kids and all that shine dissipates.

You can see this by tracking marriage rates over the last half-century, which trend in the opposite direction of what you'd expect.