When journalists suggest that picking a fight with the media is not a good idea, it was meant as sound advice, not a threat that they would fight back. But the "president" is very very poor at taking advice, and very very eager and skilled at responding (or, more often, reacting) to threats. So he took it as a threat.
When the propaganda put out by the White House differs from honest facts, the current administration feels that not going with the propaganda equates to betrayal. So if the American people want to observe the "truth" we must automatically put ourselves in the position of betraying the administration.
IMO, the wisest thing the press can do is follow the facts in the old-fashioned way, not taking sides insomuch as not siding with the propaganda, but always remaining on the side of the people. "Fair and balanced" has become a spin concept meaning that sense and nonsense ought to be equally weighed. That is unfortunate, but an ethos of "just tell the truth as you see it," in other words, be honest, might be a good light to follow.
Here's the kind of stumbling block. I am sipping a cup of very good black tea. That is an honest statement. By the time this post is read, I'll probably have put the cup in the dishwasher and be doing something else. So although you read it as am honest statement, it is no necessarily the truth. Also, that it is a good tea has to be taken as an honest opinion, not a fact. And even though I perceive the beverage as a black tea, I might be deceived and really be drinking a green tea that has cleverly been crafted to pass as black tea. So even at best it ain't as easy as it sounds.