Just before noon on a holiday weekend, while many Americans were at the beach, President Trump’s social media account roared to life. In what has increasingly become his weekend habit, he unleashed a daylong barrage of posts that put the bully in the modern bully pulpit.

There were images of Mr. Trump intimidating Canada’s prime minister with a hockey stick, personally bombing enemy targets and patrolling dark streets with killer robots. There were maps showing the United States taking over other countries, and maps renaming a state. There were attacks on the “Dumocratic Party” and tributes to himself as “the Greatest President of All Time!”

The 60 messages posted online over 10 hours and 41 minutes offered a window into Mr. Trump’s own unique reality, one anchored not in fact but in an expression of ego. For years, his social media feed was said to be a mirror of his id. But with A.I., it has become the manifestation of how he wants to be seen in a more visual, visceral way than ever before — as a warrior, as a conqueror, as a historical figure, as a younger and thinner and more muscular version of himself.

In Mr. Trump’s digitally enhanced version of the world, he is a giant in every way, a man who defeats every adversary, overcomes every obstacle and sinks every putt. He not only redraws the map of the world but vanquishes the heavens themselves. “The Moon Is Ours,” declared one post last weekend with an image of the earth’s only satellite. Another posted a few weeks ago showed him leading an extraterrestrial alien in shackles.

The rat-a-tat of ever wilder, ever more outrageous posts each weekend has become a fixture of the president’s second term, seen more and more as a barometer of his mental state. Mr. Trump’s critics, who never considered him a model of stability in the first place, now point to these frenetic bursts of fantasy and vanity as proof that the 80-year-old president is deteriorating further with age.

It is a measure of how much Mr. Trump has changed the nature of the presidency that any of this has become routine. Past presidents believed they had a duty to carry themselves with a certain dignity befitting the office. Mr. Trump sees politics like the cage match he sponsored this summer at the White House.

Indeed, the images he posted over the Labor Day weekend included one with his face on Hulk Hogan’s rippling body. Another posted a day later imagined a grinning Mr. Trump easily winning an arm wrestling match against Mr. Hogan, the flamboyant wrestling star who died last year.

“He floods the zone with so much of it that we’ve become numb to just how bizarre it is,” said Sarah Matthews, Mr. Trump’s former deputy White House press secretary. “An 80-year-old president is spending a ridiculous amount of time consuming and reposting endless A.I. fan fiction portraying him as the biggest, strongest and most important person alive. It feels like we’re genuinely watching his brain rot in real time.”