Democrats and Republicans alike have accused Ocasio-Cortez of hypocrisy.
Asked if some of her policy proposals are unrealistic, Ocasio-Cortez, a Democrat who represents parts of the Bronx and Queens, told Cooper, "What's unrealistic is what we're living in right now", she said.
"Time to walk the walk", Ocasio-Cortez wrote on Twitter.
Lieberman said Thursday that she's too "left-left" to help the Democratic Party be a sustainable political powerhouse.
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AOC is heading for a fall.
"I'm sure Ms. Cortez means well, but there's nearly an outstanding rule: Don't attack your own people", Representative Emmanuel Cleaver (D., Mo.) told Politico.
Lawmakers have been quietly criticizing the NY newcomer and are hoping to rein in her criticism of those in her own party, Politico reported, citing almost 20 lawmakers and aides.
Lieberman pointed to the many moderate Democrats who beat Republicans in purple districts in 2018. Back home in NY, she has stoked opposition to a deal with Amazon to set up offices in Queens, putting pressure on Gov. Andrew Cuomo and Mayor Bill de Blasio, both Democrats, to justify corporate incentives. Ocasio-Cortez thrust that issue into the national dialogue after she joined a sit-in protest in the office of then-incoming House speaker, Rep. Nancy Pelosi, in one of her first, rebellious acts in Washington. Rank and file are peeved that there's a grassroots movement to try to win her a top committee post they feel she doesn't deserve. "But if you look at the majority of new Democrats in the House, they tend to be, I say, center-left, if they are not left-left".
Her new chief of staff, Saikat Chakrabarti, told supporters during a November conference call that 'we gotta primary folks'.