Darroch only spoke the truth, and was also only relaying what he heard from other diplomats, what was common knowledge in their professional circles. Trump is an egotistical bully/crybaby. He insults others at the drop of a hat but can't stomach it dished back at him. He rails against anyone being the slightest bit "disloyal" to him, but he throws "allies" under the bus all the time. He is hell-bent on surrounding himself with purely yes-men sycophants.
But we all know this already. The concern here is the realization that someone inside British government can so easily torpedo another's career by such leaks of comunications that the vast majority of insiders agree were sensible and accurate observations on the part of Ambassador Darruch.
[cnn.com]

Well, duh! It is a perfect way to describe what trump's whole raison d'etre as president is about. A small, insecure, racist of a man can not tolerate that an intelligent, well spoken, physically fit black man held the highest office in the land. That the gop choose to use this man to achieve their end is the most disturbing part of the whole circus. trump's whole presidency is an act of vandalism.

I’ve been listening to ‘the reasons’ he left ..on the BBC, but wish he hadn’t. If our friends can’t tell it to us straight … who will..?

trump is so insecure that he has to disparage others to make himself feel superior. It simply chaps his ass that Obama, a black man, is far more accomplished than he will ever be, and got a lot done for this Country in 8 years.

His hatred racism and jealousy will be the undoing of us all

We always knew that didn’t we? Trump set out to destroy everything that Obama achieved right from his first day in office...he was very clear that he wanted to reverse all of Obama’s achievements....so nothing unexpected in Kim Darroch’s dispatches. What’s frightening to me is that his administration is allowing him to do this, have they collectively lost their reason?