A brawl broke out at a Bernie Sanders rally in Colorado on Sunday when a supporter of the Vermont senator confronted another man for wearing a T-shirt that read “Black Guns Matter,” a report said.

The man sporting the shirt, who is black, told CBS Denver that he was recording the presidential hopeful at the Colorado Convention Center when another rally attendee called him “racist” because of his shirt.

“He had a problem with the shirt I was wearing,” the man, who was not identified, told the news station.

“I was recording the event, he walks up and calls me a racist. But I thought, ‘What’s he know about black lives, about discrimination, or, for that matter, the representation of the shirt.'”

At some point during the confrontation, the two men began wrestling and the scuffle spilled over a metal barrier that separated the crowd from the stage, video captured by the news channel shows.

The Bernie bro told CBS Denver that the fight escalated when he heard the other man booing Sanders.

The Sanders supporter, who told the station his name is Tyler, claimed the T-shirt-wearing man knocked his cellphone out of his hand and attacked him.

He then retaliated and wrestled with him as the senator spoke, he told the station.

But the man wearing the shirt — who says he agrees with Sanders on some policies, but not on gun control — said he was shocked at being physically confronted at a political rally.

“I think it’s really a sad thing at a Bernie rally, when someone has a difference of opinion, that someone would be treated like that,” he told CBS Denver.

“I thought it really would be a lot more inclusive than that. It’s not a safe place to express differences.”

He added: “I would expect that sort of thing at a Trump rally.”