The brazen message on slippers provides clue to understand Jeffrey Epstein

In 2015, several years after his release from prison, Jeffrey Epstein showed up to a small lunch party at a Palm Beach mansion a few doors down from his own opulent estate, a neighborhood that is home to millionaires – and more than a few billionaires – like himself.

Several things stood out for one attendee who relayed this account to FOX Business. First, Epstein, a registered sex offender, easily mingled with the guests as if nothing in his past should concern them.

Also, Epstein, then in his early 60s, was accompanied by an extremely young woman whom he introduced as his girlfriend.

Then there were his shoes, or to be more exact, the obviously expensive pair of black-velvet slippers he was wearing. As the attendee remembered them, one slipper prominently featured a large ostentatiously embroidered image of a screw on its top. The other displayed a large embroidered letter “U.”

"We all got the message," the attendee said. "Jeffrey couldn't care less about what we thought about him or who he was with."

At least superficially, we know plenty about Jeffrey Epstein – his enormous wealth, his connections to Wall Street executives, politicians, his alleged predilection for soliciting minors that led to a brief jail term, and most recently, his death from an apparent suicide after being charged with operating a multi-state child sex-trafficking ring that could have put him away for the rest of his life.

But what we don’t really know is what inside Epstein’s brain made him think he could get away with his crimes and then, by some accounts, flaunting this lifestyle after he left prison in 2009. I've been asking that question a lot lately to people who knew Epstein over the years, did business with him and considered him a friend.

Their answers almost uniformly come down to the message on his slippers: Epstein's entire life and business career were a big "screw you" to doubters, detractors and just about anyone else.

This attitude certainly came in handy for much of his career on Wall Street. It helped the college dropout schmooze his way into a big Wall Street investment bank. And when he was ousted from that bank for running afoul of internal expense guidelines, it propelled him to a new career as a high-end money manager to billionaires and even become one (or at least close to one) himself.

Epstein's brashness – and willingness to spend money, of course – propelled him into the orbit of top academics and policymakers, who eagerly accepted his donations and his company. He loved to party, and he flaunted his wealth enough that it bought him friends like Prince Andrew, former president Bill Clinton and for a time, the current president, Donald Trump.