As no one is arguing about the points made by the Author I assume no one is surprised that Trumps might engage this way. Those who support Trump won't care and those that do, do.
rightleft22, I think you almost got the "issue," here, but in reality there are two separate issues that are being conflated.
The first is that Trump is rude and dismissive about large reports where prior Presidents have been gracious.
The second is the author's implication that Trump is dumb and won't read reports (implication because he can't) and that every other President read hundreds and hundreds of pages of minutia every time a report was handed to him.
I don't think there is any real dispute about the first, and I happen to think that the the first issue is ALL that is in operation here. The second issue is what I've been disputing, and in particular the author's spin on what it means that Trump is rude where prior Presidents weren't. The primary support for the author's position is nothing more than the first circumstance, and s/he's deliberately conflating and mixing the two issues.
If you can give me a reliable way to see proof that the author's spin is true it might be more persuasive, but it's going to be a very hard sell, because we all know that no President has ever had the kind of time it would take to read everything that anyone in the government wanted to put on their desks.
My strong suspicion from having been around and dealing with senior management of multiple entities over long periods of time is that the major difference is little more than Trump's rudeness, and if anything Trump's greater experience (as in decades more) as an executive that colors how he expects things to be distilled. In other words, the exact opposite of the author's narrative that Trump is somehow dumber.