The 80s because it made me not want to read Batman anymore. Batman Year One was too adult for my kid taste, and I read the reading list they're publishing: Batman Year Two and it's cover with bloodied Batman holding a gun, The Killing Joke, A Death in The Family, Many Deaths of Batman.
I was like... why so many deaths?! I didn't read any of those until I'm an adult... with varying degrees of reaction. Batman Year One turned out to be one of the best as an adult reader, The Killing Joke is controversial still, and A Death in The Family just made me laugh at Joker wearing Iranian clothing. Whatever tragedy I felt at Jason's death completely gone by that next issue.
It may not be actually worst, but making a kid stop reading Batman for me is the worst.
Today there's New 52 and Rebirth but as an adult, I don't give a ****
You make bad stories, I read something else. It doesn't affect me like when I was a kid.