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A United Airlines worker erupted at a Mexican-born US citizen during a wild airport showdown in California, threatening to call ICE on the passenger before snapping, “You don’t act like a citizen.”

The stunning exchange was captured on video Tuesday at San Francisco International Airport, where passenger Julio Varela was trying to get a ticketing issue resolved before flying to Montreal with his wife and two daughters.

“Maybe we should call ICE on you,” the uniformed employee tells Varela in a clip that has since gone viral on Reddit.

When Varela asks her to repeat herself, she responds: “Maybe you need to be, because you don’t act like a citizen. Get away.”

Varela, a Mexican-American naturalized US citizen and San Ramon business owner, later accused the employee of racism and said the explosive remark came during an hours-long ordeal to get his family aboard their flight.

“I am Mexican. I was born in Mexico. I am a US citizen. I own my own business. I pay taxes. I employ people,” Varela told KQED.

“For her, especially with what’s going on right now in America … to say that to a minority, especially a Hispanic person, I think it’s really, really hateful and it’s really racist,” he added.

“We’re looking into the interaction in this video, but don’t have anything additional to share at this time,” United Airlines said in a statement to the Post.

The dispute stemmed from a problem with one of the family’s tickets after Varela’s wife mistakenly entered their daughter’s middle name in the last-name field while booking the trip.

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Varela said the family spent about 15 hours on the phone with the airline over two weeks trying to resolve the error, but the issue remained unresolved by their travel date.

After almost three more hours trying to fix the problem, Air Canada rebooked three family members but needed United to update Varela’s daughter’s ticket before finishing her reservation.

Varela said he began filming after the United employee dismissed the family’s problem and refused to give them her name when requested.

One clip shows Varela repeatedly asking the employee to identify herself and calling her “lazy” and “rude.”

“I’ve asked you for your name,” he says.

The employee repeatedly tells him to move away before walking out of the counter area.