Yes, one could argue that your first sentence is defensible. There are lots of different ways to skin a cat. On the one hand, a military could say that it matters not a wit what we look like when bullets are flying. Yep. Look at images of WWII or Vietnam. And one could also argue that it's admirable, or similar sentiments, to still look fairly "sharp" even when there are, admittedly, much more important things to worry about. I see the latter, but find the former much more refreshing (i.e., worry about the important stuff, not the PR photos). I a particularly love the photos of FADM Nimitz and other senior officers in WWII absolutely looking like they just rolled out of bed in their cotton khakis.
But your second sentence, even "kiddingly," is nearly infinitely worse. And while I don't know your background, it whiffs of the unfortunately common, knuckle-dragging, bitter enlisted view that we should make "fragging" jokes about any officer with whom we disagree. Disgusting. And yeah, I'm a retired officer.
Zelensky could wear a suit. And one could say, "Gee, that's some discipline, even in a very difficult situation" (the view of most militaries). Or, he could wear a t-shirt, which he's obviously doing, and one could say, "Totally understandable. His country is in mortal danger. Who gives a crap what he's wearing?"
We can see both sides without calling each other DBs. But yeah, Americans....humans.