I was on the elliptical at the gym Tuesday afternoon when the news media held its Donald Trump vigil.

Cameras were trained on the courtroom doors as the panting media mob waited for a glimpse of the former president coming and going. Once he’d been arraigned, pleaded not guilty and was in the limo on the way to the airport, disappointed cable news anchors - who had hoped for some sort of bombastic statement from Trump - played  two brief loops over and over.

One was a glimpse of Trump as he entered the courtroom and one was as he left, when he raised his fist, and waved to the crowd.

Not much to see or comment upon. But one moment was significant. A few others noticed too.

I was disgusted by it. Lefties loved it.

As Trump entered the courtroom (or courthouse, unclear which) the court officer in front of him let the door close in the former president’s face, forcing Trump to open the door for himself.

A small, but telling gesture.

Very rude. Very New York.

Here, see for yourself:

It was a deliberate, f-you moment and it ticked me off. Other keen-eyed observers noted the snub and reveled in it.

This wasn’t rude only because a former president of the United States was right behind this cretin. And it wasn’t rude just because Trump is a 76-year-old man.

It was rude because common decency says you hold the door for ANYONE behind you. Yes, even someone accused of a crime. Especially if you work for the court.

I’ve lived in the South since 1975 and let me tell you, no one lets a door slam on another person. Sometimes folks will hold the door for an excessive amount of time to allow a slowpoke to enter.

Why do we do this? Because we have manners. We try to be nice to each other.

New Yorkers come up short on common courtesy every time. It’s one of the reasons I don’t particularly love the Big Apple.

For example, we had a family vacation to the city during spring break almost 20 years ago. I got up early every morning and went for a run in Central Park alongside scores of other runners.

My most vivid memory? New York joggers scowled when I’d smile and say “Hey!” Or “Good morning” to a runner approaching from the other direction. Not only didn’t these runners reply, but they didn’t smile, make eye contact, or seem to be enjoying themselves. In fact, they looked miserable.

I couldn’t wait to get home and go for a run where I was once again greeted by friendly strangers when I hit the road.

New York City boasts stunning architecture, lovely museums, incomparable Broadway productions, marvelous stores and fine dining.

It would be my favorite city in the world. If it weren’t for the rude people who live there.