Lauren Pazienza, the 26-year-old woman accused of shoving an elderly former vocal coach to her death, was blasted by her former high school and college classmates Friday, including by one who said “Karma is a bitch” about the accused killer. 

“Karma is a bitch,” Trey Siemers, a former classmate posted on a public Facebook post about Pazienza. “She told the deans I called her a firecrotch and I got suspended for it. I didn’t even know what that meant at the time until they told me I said it to her.”

The fiery socialite and scion of a cesspool dynasty has been hit with manslaughter and assault charges in the March 10 death of Barbara Maier Guster, 87, a beloved former Broadway voice coach whom she called a “bitch.”

Her A-list attorney, Arthur Aidala, claimed to the judge that “pushing someone who’s on the sidewalk” isn’t the same as “pushing someone in front of a cliff” or “pushing someone in front of a moving train” — as he accused Manhattan DA Alvin Bragg’s office of “overcharging” his client.

But Pazienza’s former classmates have come out and painted a damning picture of the Long Island native, who is a former events coordinator for a high-end French furniture company.

“What angered me most was seeing that her lawyer said she’s overcharged and is a good and moral person. She’s not,” one ex-classmate told the Daily Mail. “I knew her very well at school and she was pure trouble.”

The former friend added to the outlet: “She’s the poster child for white privilege. She never faced any consequences in her life. She was enabled by her parents who got her out of everything, but she called them stupid and basic.”

The outlet spoke to two former classmates on the condition of anonymity.

Some of Pazienza’s former classmates at Ward Melville High School took to social media to express their shock that she’s now facing manslaughter and assault charges.

“This girl was in my 11th grade science class,” Justin Iandoli, of Stony Brook, wrote on Facebook Wednesday. “There’s always two sides of the story but smh crazy!”

Others on the public post accused Pazienza of making her hometown of Port Jefferson “look bad” while some insisted they weren’t entirely stunned her name resurfaced in news reports years after they attended school together.

“Totally shocked and absolutely not surprised all at the same time,” former classmate Sean Foote wrote.

Another Ward Melville alumni, Aileen Buccella, said Pazienza “always seemed quiet and nice” and frequently had a smile on her face.

“Who knows what happened, [she] definitely didn’t murder her on purpose so it’s a sh-tty situation for sure,” Buccella wrote. “No excuses for shoving an elderly person, but again who knows … Only time will tell when she tells her story.”

Pazienza fled to her parents’ home after the random attack and made “every effort to avoid apprehension” — including deleting her wedding website and taking down all her social media, the prosecutor said.

When detectives showed up at the home on Monday, her dad claimed his daughter wasn’t there, prosecutors allege.

Her attorney then contacted police and Pazienza turned herself in on Tuesday.

Pazienza’s former classmate told the Daily Mail that the suspect “has no empathy” and was prone to speaking to people in a derogatory manner — including “fat people and deaf people.”

The outlet obtained video that the source alleges shows Pazienza “mocking deaf people.”

In the clip, she is seen contorting her face and speaking in a distorted voice that the person said was her way of making fun of the hearing-impaired.

“She’s not a good person. She has a fiancé, and she went to high school, and she went to college but none of these parts of her life were normal,” the former classmate said.

Another source also told the Daily Mail that Pazienza was “manipulative” with her fiancé, Naveen Pereira.

“He was reserved and very kind and seemed annoyed with her when I met him and fearful of her,” the person said. “She was a very manipulative person.”

The ex-classmate added: “I witnessed her behave recklessly. She would throw herself in front of cars in the street. She was a complete wild card.”

A former classmate told Fox News earlier this week that Pazienza bullied him after he moved a few doors down from her in the second grade — and it got so bad that a teacher had to separate their seats in the classroom.

The Post attempted to visit Pazienza at the lockup on Wednesday, but she refused to speak, looking drawn in a gray jumpsuit, her long red hair slightly disheveled.