The straphanger attacked by four thugs on a subway was pummeled when he told the breakdancing fools not to badmouth his fiancée, he told The Post.

“They were telling people, ‘Move! Give us room!’” chivalrous victim David Giaccone, 40, told The Post about the four men, all in their 20s, who boarded the southbound A train in East New York about 1:20 p.m. Wednesday.

“One dancer started saying, ‘If I had a gun, you would all tip me better,’” he said.

Giaccone kept mum at first, but spoke up when one of the performers called his 26-year-old girlfriend, Kassandra Noche, a “b—h.”

“I told him not to do that. He jumped at me and punched me,” Giaccone said. “I got up to fight him and his boys started getting shots in on me. I head-butted a few of them.”

When Noche tried to intervene, one of the dancers hit her, too.

“Stay out of it,” one man said as he pushed her away, according to police.

The four men fled from the train when it pulled into the Euclid Avenue station.

Giaccone was treated at Brookdale Hospital for cuts and bruises to his head and face.

“You don’t dance for entertainment and then threaten [people] for money,” he said, adding that the quarrelsome quartet often performs on the subway.

“I think the cops will catch up with them,” he said. “They grabbed my fiancée’s book and left a smudged handprint that the cops were able to grab, so they’ll know who they are.”