After interviewing Teresa Giudice, the radio host calls her "rudest."

Avoid her if you don't know namaste. Boston radio host Billy Costa branded Teresa Giudice as an "idiot," "nothing," and a "hulk" after she reportedly "hit" him in a live interview Monday.

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"She was probably, hands down, the cruelest person I've ever interviewed," the 69-year-old radio presenter stated on "Billy & Lisa in the Morning" following the interview.

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The 50-year-old "Real Housewives of New Jersey" actress promoted a Lynn, Mass., event.

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After Costa queried the Bravo star about writing "Turning the Tables" after her 2015 11-month prison sentence, the encounter turned.

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"Teresa, we know you did some time in prison, yet you came out of jail and published a bestseller about your time in prison. Did it focus a lot on prison food?" Costa asked her.

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Giudice told the radio host she "didn't want to talk about that." The reality star replied, "I don't know whether you know this, but I'm a four-time New York Times best author." Costa confirmed that he did.

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"We'll have fun, and positivity is key, right? Non-negative? The "Ultimate Girls Trip" star told the radio presenter, "You should learn some of that." Costa answered, "Work on that."

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One of the show's other hosts, Justin Aguirre, then joined in and argued that they weren't being "negative," as her book is "part of [her] bio" — which was handed to them by the "RHONJ" star's publicist.

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"I have a podcast called 'Namaste Bitches,' [and] you should listen to it and learn how to be a little more namaste," Giudice continued before her rep cut her off and invited the hosts to her client's event.

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Giudice still needs to address the hosts' comments. Her spokesman and attorney, James J. Leonard Jr., privately tells Page Six, "I think Mr. Costa has to focus on being a bit extra namaste like Teresa is

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"I urge he listen to Teresa's podcast, 'Namaste Bitches,' to work on himself and learn how to handle guests on his show."

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After two people called in, Andy Cohen addressed the matter twice on his SiriusXM show, "Andy Cohen Live," earlier this week.

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"They had to say something for her to be unpleasant," said the 54-year-old "Real Housewives" executive producer.

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Cohen looked astonished, saying, "That's what's occurring in Boston this morning. I like it." The caller said that Giudice was "rude right from the bat."

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Cohen asked the second caller for more facts and understood when she indicated that the hosts had spoken about incarceration. "OK, there you go," the Bravo boss said. "He started with jail."

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