Is it true you don't like anything from Grant Morrison, or just the man himself at all?
I don't think I've mentioned my thoughts on Grant Morrison here but I do really love Grant Morrison's early DC work, in particular Animal Man being one of my favorite comics of all time, but I find their later work to be so terrible that I consider it my least favorite comics of all time. I blame this on the running themes of Metatextuality and a sort of reconstructivist ideology in Morrison's work that has ended up completely antithetical to what i desire from comics.
While the absurdist ruminations on the nature of fiction in Animal Man made for an amazing and radical sort of comic that deconstructed a lot about both superheroes and the relationship between fiction and reality, over time their work fell into what to me feels like just very shallow and uninteresting narratives that frequently fall into the same traps as like, redditors and youtube theorists, where it doesn't really have that much to say beyond "woah... this is a work of fiction and we're breaking the fourth wall!!!!!1111" and "superheroes are actually super cool and should never be criticized". The top examples i can think of are their Batman run, which brought back several concepts but in ways that felt shallow (was it really that necessary to bring back the Batman of Zurr-En-Arrh as an edgy violent alternate personality?), meanspirited (Son of the Demon being brought into canon, but retconning Bruce and Talia's loving relationship to... that.), or even offensive (if you're going to make a modern version of the Batmen of all Nations, even if you're going to be rewriting them to attempt to make more realistic and progressive incarnations of them is it really necessary to keep the more offensive designs, and redesign others to be even more offensive? I don't think they had people of color on hand for that stuff...). Meanwhile there's the multiverse stuff that I just really can't bring myself to care about, that kind of thing is already really boring for me personally and though Morrison tries to make more meaningful narrative in them that narrative is just "Aren't superheroes really epic and cool?"
There's also the fact that regardless of being nonbinary Morrison hasn't really had the best track record when it comes to depicting minority groups. I already mentioned the Batmen of all Nations but there's them turning Talia into a misogynistic and somewhat racist stereotype, and Professor Pyg, who's Buffalo Bill-type queercoding is so offensive that I genuinely can't stomach it as a character. This is more controversial, but I feel this even about A Serious House on Serious Earth, both in the character of Mad Dog but also in the comic's general depiction of Batman's rogues' gallery not as characters of their own but as caricatures of mental illness existing primarily as foils for Batman's personal conflicts, which bled into the comics and kind of became a defining part of Batman as a franchise and its frequent usage of psychological themes.
Morrison also has a particularly unfortunate flaw in that theyre kind of... redditbrained. They're famous for their personal theory on the ending of the Killing Joke of how it actually represents Batman finally breaking his one rule and killing the Joker, despite how the comic very clearly frames the moment as the one last moment of understanding the two will ever have. There's also Morrison's idea of all Batman media being true, and justifying it as the sillier parts of Batman being caused by... him and Robin being on drugs. They've literally said that.
My main like, ideological opposition to Morrison though is in their reconstructivist themes and the way they place superheroes as like gods to be aspired to. I certainly fall closer to Moore when it comes to my perspective on comics and while I don't think they're beyond salvation Morrison simply isn't doing them any favors. I just don't want to see comics about how epic Batman and Superman are or whatever, I want to see more radical stuff that breaks down superhero comics as a whole. By all means I like seeing the weird reinvention of old concepts, but being so stuck in the past is just kind of, stupid.