‘Manspread’ guy nabbed

COPS HAVE ARRESTED a man suspected of punching a woman in the mouth on a Brooklyn train after she criticized him for “manspreading.”

Derek Smith, 56, was busted Saturday in the underground assault on 37-year-old Sam Saia, police said.

“It was a big relief for me,” Saia told the Daily News after learning about the arrest. “I’m happy that he’s caught.”

Saia was riding the N train through Bensonhurst on Thursday morning when the man sitting next to her opened his legs wide, crowding her into the side of the subway car.

The man allegedly flipped out and got in her face after she asked him to make room for her.

“B----, you ain’t nothing! I’ve raped white b-----s like you, you f---ing c---!” the man yelled, according to Saia.

The surly straphanger punched Saia in the mouth, splitting her lip and thrusting her head against the wall of the subway car. A fellow rider sprinted through the car and grabbed Smith (photo). He got off the train at the next stop.

Smith has two prior arrests, including one for sex abuse, cops said.

Saia said she tried to file a police report immediately but got the runaround. The NYPD has opened an investigation into her claims. Now she’s looking forward to moving past the ordeal.

“If I don’t have to, I don’t want to face him again,” she said. “I just want this to be over. ”