Well, that escalated quickly… All it takes is a few words on public transportation and you can end up with a fat lip!

According to NYTimes: A woman says she was slugged in the face by a racist lunatic on the subway — all because she asked him to stop “manspreading.”

The aftermath of Thursday’s violent exchange was caught on video as a good Samaritan tries to defend the woman and usher her violent attacker off the train.

The victim, Sam Saia, said she was riding the N train through Bensonhurst while on her way to work in Manhattan when the man sat down and started overcrowding her around 7:45 a.m.

“He proceeded to press me against the wall and man spread me excessively,” she wrote on Facebook after the incident.

“When I asked him to give me room, he yelled ‘B–ch, you ain’t nothing! I’ve raped white b–ches like you, f—ing c–t! You ain’t nothing, you f—ing b–ch!’”

The woman said she put in her earbuds and tried to ignore the raging man as he continued his tirade.

But the man then socked her in the mouth, bloodying her lip and knocking her head into the wall behind her, she said.

That’s when a man ran to the woman’s defense and started grappling with the suspect.

The good Samaritan, who described himself as being “not on duty right now,” told him to “get the f–k off the train.”

The attacker tried to apologize to the woman before exiting the train.

In her Facebook post, Saia said she reported the incident to police, although the NYPD said they did not have a report on file as of Friday morning.

The video is being investigated by police, an NYPD spokesman said.

Here is the video of him stepping in after the punch: “Woman punched in the face manspreading on NYC subway”

Here is an interview with the good samaritan who stepped in: