A nasty row has erupted between New Zealand comedian Jemaine Clement and actor Scott Baio, an outspoken Donald Trump supporter.
The argument even descended into insults over Clement's hair and accusations that he "lives with a lot of sheep".
Clement, meanwhile, compared Baio to fascist dictator Benito Mussolini, a political and military ally to Hilter during World War II.
Clement is the actor, musician and comedian best-known as one half of Flight of the Concords. Baio is an actor who played Chachi Arcola in sitcom Happy Days and star of Charles in Charge. Baio publicly endorsed Mr Trump's bid for Presidency.
The row became fierce on Monday night, after Clement responded to a tweet by Fox News.
The tweet features a quote from Baio, saying "The 'tolerant people' are the most vicious, violent, intolerant people I've ever seen."
Clement responded to a Twitter user who agreed with the tweet, saying: "The only one pretending to love you is your wife. No one loves you."
Baio seemed to think the tweet was directed at him, which is when things kicked off.
"You're an angry snowflake", Baio tweeted at Clement.
Clement was widely retweeted when he wrote "Scott Baio supporting @realDonaldTrump is the worst Italian-German pairing since 1945."
Baio has deleted tweets since the spat cooled off, but has left up tweets saying he bets Clement "lives with a lot of sheep" and another claiming to be thinner, with a fuller head of hair than Clement.
"It's nice to be thin & have all of my hair at 56. WTF happened to you? Born in 1974. Yeah OK", the tweet reads.
Both men fired off a number of tweets from their accounts, with Clement explaining to his followers that "I know you think I've gotten all serious, but 1, I do think these things are important and... 2, It gives me joy to annoy racists..."
It's not the first time Baio has faced celebrity confrontation for his support of Trump.
In December, Baio claims he was "physically assaulted" by Nancy Mack, the wife of Red Hot Chilli Peppers drummer Chad Smith.
Baio told media at the time that Mack asked him how he could support someone who said, "Grab 'em by the pussy," and then seized him under the arms and shook and pushed him.
TMZ reports that sources close to Mack say she was "merely trying to show Baio how Trump hugs women".