Well, in all honesty, it's really time to amend that claim. Even so far as to say things like "Joe Q hates Spider-Man, he broke up the marriage" are simply put, not true. It's often because a writer is very fond of a character that they go the extra mile to put their mark on the character and try to create a milestone with their run.
I can't honestly consider "Morrison must hate Batman" as anything but baseless fan venting, given the sheer amount of detail and care that's gone into his crafting of his big Batman story for the last few years, whether you've enjoyed it or not. The man's done his research up through the most obscure annals of Batman's history for this story. It's a love letter to Batman.
Anyone who thinks that And then, Batman dies is the end of this story is being manipulated by the emotional investment they have in the character. And that is FAR from a negative thing.
Remember that stories are usually written on something of a curve. You start out low on the emotional scale as the setting and characters are established. You ramp up the emotional investment as you near the climax - but bear in mind that the climax of a story is NOT its conclusion.