I think that Trump fusses about anything and everything. Frankly, I generally ignore him. He's a grumpy old man.
There's no question that Kim Jong Un is utterly ruthless and unreliable in terms of any agreements he pretends to reach with the West. If China finds him annoying, they can shut him down at once.
Trump has no clue how to conduct international diplomacy. When you have a foaming at the mouth madman threatening people, one good rule of thumb isn't to threaten that you can kick his ass, it's to try to isolate and contain him, not goad him.
I see Kim Jong Un as a sort of wild animal, who by virtue of his birth, came into power at the head of a totalitarian state where he simply resolves any conflict by having his enemies killed. This is not a guy you threaten or reason with. It's someone you defeat by stealth and distraction. Trump is an overgrown bully who just insults anyone he dislikes. That's not a great way to deal with conflict, on the playground or the international stage. As a diplomat or a national leader he's essentially incompetent. That's why I hope he remains in office for the rest of his term. The Vice President is infinitely more scary to me.
Incidentally, Sports Illustrated devoted this Trump vs NFL business to its front page in the latest issue. Those guys get paid to play football the same way that actresses get paid to be in movies. So lots of people get pissed off when some actress or another uses the platform of the Oscars to make some political speech instead of just thanking the people who made it possible. I see the protests at the NFL in a similar vein. These are men with a broad public following. They, too, use their public platform to make a political statement. I'm not commenting on the relative merits of statement per se, but many people are agitated about this, some very strongly support it while others find it an inappropriate disgrace.
And I suspect football has a short future ahead given the damage it inflicts on players. The more we know about it, and its neurological consequences, the more problematic it will become to support.