Foul-mouthed, anti-cop lawbreakers jumped turnstiles en masse during wild demonstrations in Brooklyn, disturbing footage shows.

“F–k this s–t!” screamed those among the hundreds who swarmed the Hoyt–Schermerhorn station in Downtown Brooklyn Friday night to protest the NYPD’s planned crackdown on fare evaders.

Footage of the scene posted to DailyMotion shows cops getting jeered by protesters, who belt out “F–k You!” as they flip off the Finest.

The demonstrations come in the wake of two controversial police actions in the borough, including one where an officer socked a 15-year-old in the face during a chaotic melee at Jay Stree-MetroTech station.

Above ground, vandals defaced police cars.

One protester, Sarah Autz, 25, was arrested for allegedly scrawling “PIGS” on a cop car, while another person got away with tagging “NYPD KKK” on a department vehicle, an Instagram stories post shows.

These incidents come a day after a Halloween night crowd mocked cops as they removed a pile of trash thrown on their car in Brownsville.

All acts of vandalism remain under investigation, cops told The Post.