CNN offers a little vignette illustrating how routinely horrible Trump is to everyone around him.

President Donald Trump was fuming as he sat in his Phoenix hotel watching news coverage ahead of his rally.

The venue for his first rally in nearly three weeks looked empty.

That’s when George Gigicos, Trump’s longtime advance man, got a call from Keith Schiller, the director of Oval Office operations who is almost always at Trump’s side, asking Gigicos why the crowds were scarce. Gigicos explained that while TV correspondents were live early from the venue, the rally wouldn’t start for several more hours and crowds had just begun to trickle in.

Oddly enough people don’t want to arrive at events hours early so that they can hang around doing nothing for hours. But Trump apparently thinks they ought to when he’s the one they’re coming to cheer.

Soon after, Gigicos heard from Trump himself. The President was irate, warning his former director of White House advance who had since returned to his private contracting business, that the venue better be full by the time he arrived, two sources familiar with the discussions told CNN as they described the scene and the President’s reaction.

Then after the rally Trump gave him the boot.

“George will be back,” one source familiar with the matter said, noting that Trump’s angry tirades are “not uncommon.” “This is what (Trump) does. He tries to get under your skin.”

“It wasn’t great, but it also wasn’t the worst thing I had ever seen,” another source said.

In other words, Trump is such an asshole that his firing someone because a venue was empty hours before an event is just ho hum, no big deal.

He was a nightmare throughout the campaign, too.

Trump would regularly call Gigicos before rallies to ensure the rally would deliver the crowd size he had come to expect. And if it didn’t meet those expectations, Gigicos would get upbraided by Trump, sources familiar with the Trump campaign said.

It wasn’t just the crowd sizes. Trump would also get upset during the campaign if the venue for the rally were too small, the sources said.

The fire marshals were also frequent targets of Trump’s ire, with Trump frequently calling them out from the stage and urging them to allow more people into the venue in spite of fire safety statutes.

During a January 2016 rally, Trump angrily complained about the faulty microphone at his podium, complaining about the “son of a bitch” who installed it.

And then, Trump added: “Do you hear that George? Don’t pay him. Don’t pay him,” Trump said. “And you gotta be tough with your people because they’ll pay, they don’t care. They’ll pay.”

A chronic habitual bully and narcissist.