#Black Lives Matter protester punched by police supporter during Brooklyn rally

A Black Lives Matter protester was punched in the face by a pro-cop demonstrator as the two sides clashed in Brooklyn on Sunday, new video shows.

“I got rocked in the face by a white supremacist … trying to protect his mom,” the unnamed woman can be heard saying on the video taken in Bay Ridge.

The man, who was part of the Blue Lives Matter rally, was hauled away by cops and put into a NYPD van — as protesters yelled “put that piece of s–t in there.”

Black Lives Matter protesters then squared off against cops on the streets as they tried to block the NYPD van.

At least one protester can be spotted getting cuffed as white shirt supervisors try to clear the path for the van. The 28-year-old was identified by cops as Eric Titien, who was charged with obstruction and disorderly conduct.

Police did not have any information on the arrest of the man who allegedly slugged the woman.

Later in the clip, a man with the pro-cop demonstration outside The Leif Bar on Fifth Avenue can be heard yelling at the protesters to “go home” — before being bloodied by the demonstrators.

The brawl was eventually broken up by the protesters — as one yells “What are you guys doing!? He’s old! You guys are gonna kill him! Back the f–k up!”

Two were arrested in that scuffle but their names and charges were not immediately available, cops said.

Sunday marked the second night of a tense standoff between both sides in south Brooklyn.