Tom Arnold and Dean Cain’s Twitter confrontation spills over into a face-to-face argument.

It all started when Arnold called out Cain online for appearing at the Values Voter Summit, hosted by conservative Christian group The Family Research Council, according to The Hollywood Reporter.

“Dean Cain is another Donald Trump loving, fake Christian coward which makes Dean Cain anti-LGBTQ and racist,” Arnold tweeted with the hashtag, “#complicit.”

“Tom, you’re a cowardly, slanderous weasel,” Cain tweeted back.

RELATED: Tom Arnold Responds To Roseanne Barr’s Character Being Killed Off

The two engaged in a heated argument backstage at Larry King’s studio on Tuesday. Footage shows the celebrities repeatedly talking over each other before Cain puts his foot down: “I’m not a racist person; I never have been.”

“I’ve always supported gay rights,” Cain insisted. “Let me finish for a second. You’re giving me guilt by association.” Arnold likened The Family Research Council to “Nazis.”

“They’re hurting people. You know how many suicides of f**king gay kids? They f**king shame them and they try to keep them out of f**king schools,” Arnold argued. “Please hear me. That’s why it’s so visceral… I don’t want those f**kers using you.”

Cain — best known for his role as Superman in the “Lois & Clark” television series — bit back, “Nobody is using me. I speak my mind.” The two ultimately found common ground and hugged it out, but the fiery debate quickly resumed online.

RELATED: Dean Cain ‘Unapologetic’ For Defending Legacy Of ‘American Sniper’

“He called me #racist and said I was anti-LGBTQ. Totally untrue. After I confronted him, he backed down,” Cain tweeted. “That’s how it always seems to work.”

Arnold had a different recollection of the events. “I didn’t back down,” Arnold told THR. “I was giving him a break by not assuming he was stupid about the FRC, which I do liken to Nazis, and now I see he’s one of them.”

Arnold even threatened to physically fight Cain: “He played this icon, Superman, but he’s an idiot. If he wanted to fight, I took my glasses off for him. He’s a f**king p***y. Next time I see him we’ll get it going and his buddy can film it.”

A witness told the outlet, “Dean was intense. He looked ready to do something if Arnold came at him.”

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