Donald Trump was in his element trading quips with NBC “Tonight Show” host Jimmy Fallon Thursday night, and the highlight came when the Republican presidential nominee allowed the host to do something one seldom sees: muss up his hair.

Liberals went full-throttle berserk, however.

Clip via The Tonight Show Starring Jimmy Fallon

Fallon observed that at their next meeting Trump “could be the president of the United States,” and asked permission to do something non-presidential before that very real possibility.

Although the audience loved it and screamed in delight, liberal heads immediately exploded and the heads’ owners vented their wrath on social media.

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https://twitter.com/Always_Trump/status/776658975731257344

@KatyTurNBC I will never watch Jimmy Fallon again. That’s how strongly I feel about humanizing a monster — Empty the Basket (@puppymnkey) September 16, 2016

When you are neutral in the presence of racism and bigotry, you are part of the problem Jimmy Fallon — R Joseph (@rjoseph7777) September 16, 2016

Jimmy Fallon is an exaggerated example of what the MSM is doing. Humanizing a monster. The most dangerous thing you could do. — Kalliope (@KAmorphous) September 16, 2016

Jimmy Fallon blew it tonight. Late night comedians used be the court jesters of culture. Humanizing a xenophobe is not okay. #FallonTonight — Ateeya Manzoor (@Ateeya) September 16, 2016

@MarkHarrisNYC for @realDonaldTrump to be able to sit down with anyone and not be made to feel ashamed of himself and his words is criminal — Caitlin Rose (@TheCaitlinRose) September 16, 2016

Others said lighten up — it’s all in fun so just learn to sit back and enjoy the show.

@Ateeya Just go to your safe place & it will all be ok. Love how #Hillary is the murderer #Arkancide but #Trump is the bad guy.Wake up! — DEPLORABLE Mike (@M_RevereUSA) September 16, 2016

@MarkHarrisNYC trump was amazing. Funny. Real! And a good sport. #VoteTrump2016 — WE THE PEOPLE #maga (@caddie92) September 16, 2016

@MarkHarrisNYC Hurray for tolerance of dissenting opinions. — Jake Turx (@JakeTurx) September 16, 2016

LOL look at these Twitter trolls going after Jimmy Fallon just like they did Matt Lauer after @realDonaldTrump‘s brilliant performance — DEPLORABLE Brandon (@BrandonBast) September 16, 2016

Not a Trump fan, but I gotta say it’s pretty funny watching Liberal heads explode because Jimmy Fallon dared to have him on. Good Stuff! — #NeverClinTrump (@GadsdenRattlers) September 16, 2016

“Jimmy Fallon” The one night show host who’s actually funny and doesn’t shove liberal propaganda down your throat. pic.twitter.com/AsfWs9tRJ8 — NexGenStriker (@NexGenStriker) September 16, 2016

William F. Buckley Jr., the late publisher and conservative icon once observed: “Liberals claim to want to give a hearing to other views, but then are shocked and offended to discover that there are other views.”

His point was proven again Thursday night.