Breitbart provocateur Milo Yiannopoulos on Friday appeared on HBO’s "Real Time,” praising host Bill Maher "literally the only good [liberal]" while attacking progressives like "Girls" creator Lena Dunham.

“The Democrats are the party of Lena Dunham,” Yiannopoulos said. "These people are mental, hideous people, and the more that America sees of Lena Dunham, the fewer votes that the Democratic Party is going to get.”

“Let’s not pick on fellow HBO stars,” Maher joked. “There are so many other people.”

Maher explained why he booked Yiannopoulos, a decision that led to journalist and The Intercept co-founder Jeremy Scahill to back out of his scheduled appearance on the show.

"If I banned everyone from my show who I thought was colossally wrong, I would be talking to myself," Maher said.

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"All I care about is free speech and free expression," said Yiannopoulos, 32, who is openly gay and an editor at the conversial conservative website Breitbart. "I want people to be able to be, do and say anything. These days, that's a conservative position."

"I care about the environment and living also," Maher replied.

The conversation turned to the proliferation of political correctness, a topic Yiannopoulos and Maher agreed on.

“The reason [liberals] want to police humor is they can’t control it — because the one thing all authoritarians hate is the sound of laughter,” Yiannopoulos said.

“And also because when people laugh, they know it’s true,” Maher concurred. “You are so helped by the fact that liberals always take the bait.”

“Nothing annoys people like the truth,” Yiannopoulos said. “Policing humor for racism and sexism is utterly wrongheaded. Not because normally it’s not there, but because that’s how we build bridges and not how we break them.”

Last summer, Yiannopoulos was banned from Twitter after he and his followers viciously attacked Leslie Jones, a black actress who starred in a "Ghostbusters" remake that featured women as the main characters.

“I wrote a bad review of the movie. I said she looked like a dude, she does," Yiannopoulos said. “I said she’s barely literate, she is."

"And I simply don’t accept that the star of a Hollywood blockbuster is sitting in a Hollywood mansion crying over mean words on the internet; get over it. Mean words on the internet don’t hurt anyone,” he said.

Maher retorted that some would arugue that Yiannopoulos' messaging has motivated people to act violently.

"Well, then they would be idiots,” he replied before saying directly to the "Real Time" audience: “You’re very easily triggered; it’s pathetic.”

Yiannopoulos also took slammed Scahill for backing out of his chance to debate him on Maher's program.

“That silly man who had a hissy fit,” he said. “If you don’t show up to debate, you lose.”

"He has ample venues to spew his hateful diatribes,” Scahill wrote in a statement earlier this week explaining his decision to pull out of the show.

“There is no value in ‘debating’ him. Appearing on ‘Real Time’ will provide Yiannopoulos with a large, important platform to openly advocate his racist, anti-immigrant campaign. It will be exploited by Yiannopoulos in an attempt to legitimize his hateful agenda."