A Starbucks barista dumped a cup of scalding hot chocolate on a customer who refused to leave at closing time, saying, “You don’t mess with me,” according to a new lawsuit against the coffee giant.

Anna Kazachkova, 28, of Queens, entered the Starbucks on East 42nd Street between Lexington and Third avenues at 9:50 pm on Jan. 17, 2016, according to her Manhattan Supreme Court suit.

“They asked me if I wanted to stay or wanted to go and I said, ‘Sure, I’ll stay.’ So they gave me a tray and I went to the table,” she said.

Less than five minutes later a second employee, the barista, came and told her to leave, the suit says.

Kazachkova asked for five minutes to finish, but the barista grabbed her cup, said, “You don’t mess with me” and “poured the chocolate all over [her] causing temporary injuries to her face, hands and damaging her clothes,” the suit says.

Kazachkova is suing for unspecified damages.

Her attorney, Vano I. Haroutunian, said they filed suit after Starbucks refused to hand over video of the incident without a court order.

A spokesman for Starbucks said that after an investigation, execs found her claims “meritless.”