Serenity now, America.

Like an old man trying to send back soup in a deli, Donald Trump was angry during his press conference on Thursday.

He was mad at the "out of control" press. He was livid at the "criminal leaks" that led to the resignation of Michael Flynn. He ranted about the "fake news" overshadowing all his tremendous accomplishments.

"It was an airing of grievances," said CNN's Jake Tapper afterwards. "It was Festivus." And like that, Festivus references took over Twitter. The term was trending, and grievances were flying.

Did Trump just pull a Festivus? #TrumpPressconference was the airing of grievances. Well done to the reporters 4 their good Qs #FreePress pic.twitter.com/iVhldo6ZbG — Luay Jahshan (@LuayJahshan) February 16, 2017

Ha, @KatyTurNBC calls Trump presser "Festivus," one long airing of Trump grievances. — Joan Walsh (@joanwalsh) February 16, 2017

Is it Festivus already? How did I miss that? — Dorothy Winsor (@dorothywinsor) February 16, 2017

Is it Festivus already? A lot of grievances are being aired — Chuck Todd (@chucktodd) February 16, 2017

Every day is now Festivus. — Binyamin Appelbaum (@BCAppelbaum) February 16, 2017

Sure, the press conference was missing a few things: a pole (with a very high strength-to-weight ratio) and the feats of strength. But the airing of grievances was pure Festivus, which would mean Donald Trump is Frank Costanza.

While the rest of the world is worried about the economy and climate change, Trump can't stop complaining about how Jerry and Elaine didn't say hello to him when they saw him in the city, or that the Seinfelds are trying to keep him out of Del Boca Vista.

And while Trump fixates on minor slights and imaginary transgressions, we're all George, wondering how exactly our lives turned out like this.

There is one difference between Frank and Donald, though. Frank didn't get out of military service.