>>7426970The problem is, we don't know what happened between them. All that's known is they stopped talking a year or two before Ditko quit the book, so Lee wouldn't have had any input on the direction the Green Goblin storyline was going, or even the identity of the Green Goblin, for that matter. It's very easy to think Ditko was doing that because of antisocial tendencies or objectivism, but fans for a long time mindlessly parroted the myth that Ditko quit over the identity of the Green Goblin, so that just raises more questions about what really happened.
One thing I remembered Ditko writing in one of the essays was that when Lee and Ditko were coming up with ideas for the Vulture, Lee wanted a heavyset villain, and cited Sydney Greenstreet as the kind of look for a villain he wanted. Ditko objected to that and wanted to go with the gaunt look, which Lee didn't really want.
By the way in case you're wondering who Sydney Greenstreet was, he was an actor who was in a lot of films such as Casablanca, The Maltese Falcon, and others. In fact, if you look at this pic of him and Humphrey Bogart from Casablanca, there's a pretty good argument that Kingpin is the kind of character that Lee wanted.