After spreading the rumor that Radziwill had used a ghostwriter to pen her best-selling memoir, What Remains, the "bookgate" fight between the two escalated at Drescher's housewarming party.
"You're so pompous and so elitist," said Drescher, 43.
"I don't talk about your parenting, don't talk about my career," snapped Radziwill, 50.
"Word on the street is you had What Remains ghostwritten," said Drescher.
"There's no word. There's no street. It's dialogue from a cop show she saw," Radziwill responded. "You, Aviva, are a sick, sick person. You are a psychopath."
"Nobody writes their own book," said Drescher. (Author side note: Um, yes people do!)
"Harry, it's so nice to meet you," Radziwill said sarcastically to Drescher's ex-husband as she exited the party. "I totally understand your divorce."
Radziwill later confided in her editor, Barbara Jones, about what Drescher had said.
"That's crazy," Jones laughed. "It would be so much easier if you had a ghostwriter. A ghostwriter wouldn't be rewriting [your novel] at the last minute and driving me crazy."
There was nothing, crazier, however, than Sonja Morgan's new intern training, which included burning of candles to change the energy and talk of clogged plumbing and power-washing furniture.
"Team Sonja," as Morgan called her large group of interns, "come from wealthy families," and included Tyler, Morgan's "gay husband."
"Having an intern is like having another child," Morgan said, before explaining to her new "social media" intern that she wanted to be promoted as a "down-to-earth, hard worker, one of the people, fun."
Morgan, 50, told her interns that she got paid a lot of money to show women how to do "cat-eye" makeup as well as speaking engagements.
"I'm considered a MILF, so some of the colleges like that," she said with complete seriousness.
"Our life is a series of unpleasant business," Tyler told the new intern.
"And then we go to a gay bar and get s---faced," Morgan replied.
The Real Housewives of New York City airs Tuesdays (9 p.m. ET) on Bravo.