President Donald Trump's first tweet of the day was not honoring 9/11, or the nearly 3000 lives that were lost in that unimaginable tragic attack on America.

Instead, it was about what's always on his mind: trying to convince the world his election was legitimate and he did not collude with Russia to win.

Trump then retweeted a 9/11 tweet from his director of social media, then posted three tweets responding to stories Fox News was reporting, then he posted a tweet announcing he was traveling "to attend a Flight 93 September 11th Memorial Service in Shanksville, Pennsylvania with Melania."

And then, this:

17 years since September 11th! — Donald J. Trump (@realDonaldTrump) September 11, 2018

It appears to be a gleeful celebration of one of the worst, most deadly, and most horrific attacks on the nation. Whether or not that was his intent, that's what it appears to be.

He did not and has not mentioned the brave first responders, many of whom died working to save others. Many first responders suffer disease from the toxins they breathed in while selflessly working to help others live.

He did not mention the nearly 3000 who died. He did not mention the families, friends, and co-workers who lost loved ones that terrible day.

He did not mention the U.S. service members who went to war, a misguided war, many of whom lost their lives, or their limbs, or their mental health.

President Trump did nothing to honor those most affected by 9/11.

Instead, he tweeted a celebration of the attacks.

Many on social media were confused, outraged, and stunned:

This is NOT a celebration!!! What is wrong with you?!! Today is about remembering & honoring the massive loss of life that occurred on this horrific day in our history, and recognizing the families who have suffered losing their loved ones. DO NOT DISRESPECT THAT! #NeverForget https://t.co/qxPVM7bfrx — Morgan J. Freeman (@mjfree) September 11, 2018

The exclamation point. No words. https://t.co/GDZR3cps8I — Chris Cillizza (@CillizzaCNN) September 11, 2018

This reads like something a 13 year old would tweet. And who puts an exclamation point in this? Like we should be excited about it? What a complete and utter buffoon. https://t.co/MPvKH7I55j — T.D. Dery (@TD1TribeKU) September 11, 2018

good morning, we live in hell https://t.co/9bFs85I3JG — Patrick Blanchfield (@PatBlanchfield) September 11, 2018

good morning, we live in hell https://t.co/9bFs85I3JG — Patrick Blanchfield (@PatBlanchfield) September 11, 2018

I don't get what in the actual hell this tweet is supposed to mean. Looking into this man's history, it could easily mean the celebration of the height of Trump Tower. What a disgrace, on every level. https://t.co/daAbgOFR6a — Will McAdam (@theWillSource) September 11, 2018

When you lack the normal human capacity for empathy: https://t.co/pxbx8ajk76 — Mark Gongloff (@markgongloff) September 11, 2018

This would be inappropriate if it had come from a news journalist. That it has come from the President of the country who suffered from this attack is outrageous beyond my capacity to describe it. https://t.co/yJy3lx09ir — Pedro Henrique L. do Nascimento (@PHLdoNascimento) September 11, 2018

You act like its a celebration you incompetent dotard. Thank you to all the racist moronic inbred Trump voters for giving us this fat tub of goo to lead this country. Unfuckingbelievable. — CallingU0UT (@CallingU0UT) September 11, 2018

Wow. You are incapable of any real sympathy for those affected by 9/11. This tweet sounds like a celebration. Disgusting. — AmericanagainstTrump (@notadeplorable2) September 11, 2018

Is…is he excited about it? https://t.co/merlmRnRfG — Brian Westfall (@Brian_LifeOf) September 11, 2018

For someone who tweets NONSTOP on pointless issues, this is what the POTUS has to say to the victims and survivors on the anniversary of one of the most impactful days in our history. Glad you can do math Mr. President. https://t.co/frQo9pNbac — Analisa Adkins (@analisaadkins) September 11, 2018

Manages to make this sound like some obscene sporting victory with exclamation mark https://t.co/2iGOKvV75I — Tom Quinn (@TomTheProducer1) September 11, 2018

I briefly wondered how Trump would mark the occasion today, figuring I'd be disappointed in whatever he did, but not surprised. I was wrong about the second part. https://t.co/oztxhBo1ml — Andy Merritt (@A_Merritt) September 11, 2018