Alan Moore may be an asshole but he's the kind of asshole I'd definitely have a beer with. He may have even gotten mad at fans who liked Rorschach but for the wrong reasons, but he CREATED FUCKING RORSCHACH. That's enough to forgive him for anything.
I also love how with Watchmen he was definitely parodying Steve Ditko and his ridiculous political philosophy but at the same time also clearly admired his genius, despite having a ridiculous political philosophy himself. I mean the dude's politics are nuts, but at least he's principled about them.
And he refused royalties for the Hollywood movies based on his works that he uniformly loathes (even the reasonably good ones that do not actually massacre what he wrote), but was entirely okay with everyone else involved cashing in.