Movies where every single character is an asshole..

Secret Honor..........Sleuth........

The Devil (1972) - I think few films have portrayed the evil that humanity is capable of as distressingly and unflinchingly as this one does.

Dangerous Encounters Of The Third Kind (1980)

Ichi The Killer (2001)

Underrated little gem of a film

Some off the top of my head:

Every PTA movie
Every Kubrick movie
Parasite
The Royal Tenenbaums 
The Wolf of Wall Street*
The noir genre in general?? 

*I was inclined to say every Scorsese movie as well, but he normally has some sort of moral center present that proves to be the exception. But I think you could argue that Goodfellas belongs here, probably Casino (just haven't seen it in awhile so I don't quite remember), The Irishman probably as well, The King of Comedy most certainly... 

Well there are Jim Kurring in Magnolia and Colonel Dax in Paths of Glory respectively, who despite having flaws hardly fit this description, not to mention Spartacus.

If you watch the film as intended, Up.

I still think that's an oversimplification with Kubrick. Some of it might depend on what you mean by "asshole", just someone who is superficially a "jerk" or someone who is actually a "bad person" morally. I don't think most of the FMJ guys are bad people for instance outside of Animal Mother, Hartman, and some of the brass you see in the early Vietnam scenes. They're just stuck in Vietnam. Lolita, Mandrake and the President (he's an idiot but not at all malicious) in Strangelove, and a number of Barry Lyndon supporting characters aren't bad people either. Then like you said pretty much no one in The Shining outside of Jack. 

The above distinction is relevant with Phantom Thread for PTA too. Woodcock has an unpleasant personality but he doesn't actually do anything that's really all that bad. Don't really think this applies at all to Alma either, the omelette thing is just a game they play, she wasn't really trying to kill him or anything. 

Well if we're really getting into this...

It might be reflective of a personally cynical outlook on humanity or something but I was definitely going by that former broader definition of "asshole" -- i.e. someone who is selfish, generally mean/rude in their demeanor, etc. For me, being an "asshole" =/= maliciousness or being "evil," those are two drastically different labels.*

In the case of Full Metal Jacket ... I mean, to me those guys all have really off-putting personalities, even if the point is that the ruthlessness of the system forces them into being that type of bitter person, it still applies. 

So, yeah, I guess it's naturally a matter of perspective, but that said I don't really understand how someone can see Reynolds Woodcock as being not an asshole?? With Alma it's a little trickier, the interesting thing about the character is that I've talked to so many people about her who read the character drastically different -- some see her as a hero, some have literally said she's an "asshole," and it's not even as simple as a gender difference thing either where women have the former view and men the latter, it might account for some discrepancy but I think it's far more inconsistent than that. To me, I don't think I'd describe her as an "asshole." But I think she can be an asshole, and that's part of the strength of the character. 

*Though I guess the thread might be asking more for examples where all the characters are malicious/evil in some way, as one of the examples Drish mentioned in the OP was Succession where all the characters are just ruthless and evil rather than your run-of-the-mill asshole types. 

Yes Alma is an interesting character and there was a lot of debate about her online after the movie came out (although I did observe somewhat of a gender divide). From a certain angle I can see it, the omelette thing does technically constitute assault/abuse. But it's sort of a "movie rules" situation. Deep down Alma the character knows that that's what Reynolds wants so she can take care of him. You obviously can't "know" something like that in real life, but she's a character in a movie so she knows what the filmmaker wants her to know. I was a bit taken aback by it on the first viewing but on rewatches I just found it sweet (that might somewhat resemble Reynolds' reaction in the movie!  )

Pretty much everyone in any Todd Solondz film.