I honestly don't know if writers "hate" him or not. To me it would be kind of silly and strange that someone would hate a person that doesn't even exist.
Do some writers not know what to do with him? Probably. Some might also be hesitant to use him in fear of being labelled as being okay with domestic violence. We fans sure have been told that on many occasions.
There are things worth mentioning that people seem to forget or just don't know about. Hank and Jan got married in1968, and divorced in 1982. During that time, they were not always in publication but each time they were, they were shown as a loving couple, happy to be together. So the accident with the chemicals that "created" Yellowjacket, and the bout of manic that led to the infamous slap and the divorce are two separate things that happened almost fifteen years apart in publication. They are not related to one another.
Also, there was no mention of self-medication on Hank's part anywhere in the comic books, at anytime. He wasn't experimenting with self-treatment when he got into the accident that created YJ. The only time medication was mention was during Secret Invasion or Civil War (can't fully remember, sorry) where Skrull-Pym was shown with a bottle of anxiety pills, and at another time someone mentioned that "Hank" was on antidepressants. The only time we saw a clear mention of self-monitoring was during Avengers A.I., where Hank had devised a prodromal detection therapy where it would track his mood, behavior and so forth to try to predict when a manic cycle would appear. Nowhere is there any mention of chemical medication. Nowhere. Furthermore, I would add that Hank has never been a drunk (wasn't mentioned in this thread but it pops up from time to time). Through all the years I have read about him, I have never even seen him drunk.
There's also this thought that he's not been used in comics because of the slap, or that he can't be redeemed, it's too late for him, etc... It's easy to look at it from this angle now, with everything already published, but we seem to forget the actual amount of time that passes. First, yes, the slap. In 1982. Then that's true that he wasn't used for some time but he got back to WCA within a few years and was one of the most prominent members of the team. Then he came back to the East Coast Avengers, was involved in pretty much everything up to and including Heroes Reborn, Heroes Return, then Busiek's run that lasted quite some years. He was at the forefront in Civil War (it was a Skrull, but we didn't know that at the time), Secret Invasion, Mighty Avengers, several minis and events, Avengers Academy, Secret Avengers, etc... Heck, he was even part of the team that helped bring Cap back in Captain America Reborn. The truth is he's been present in one way or another all through Marvel History, up to Rage of Ultron. Funnily enough, that's about the time the first Ant-Man movie came out. Coincidence, or shenanigans from Marvel? I honestly don't know.
So the slap is not an excuse from Marvel not to use him because they have used him plenty since then, and frankly no one cared that much. He was a good character that most enjoyed reading about. Only in recent years has this whole conversation started again, not sure why to be honest. I think it might have to do with younger writers who are not well-versed in earlier canon and decided to dig out old, resolved stories to bring drama forward. And yes, the story was resolved, by Busiek. Anyone who has read the "Ultron Unlimited" storyarc will know this to be true.
Completely agree with you there
Scott was chosen for the Ant-Man movie because Edgar Wright wanted to make a Scott Lang movie. The first comic book he read as a kid was Marvel Feature #47 and he really liked the character and his storyarc.
Great to see I'm not the only one thinking this!!