I wouldn't hate spoilers so much if I didn't hear so many.
I didn't hate spoilers a lot as a kid, but now that I never get to be surprised by things, I really can't stand them.
By the time I read Harry Potter, I knew exactly who died and how, what happened and why.
It's to the point I won't listen to people if they talk about something I haven't read/watched.
Even if they swear no spoilers, I don't really want to hear it.
Even "not a spoiler" information can affect how I look at what's happening.
I much prefer the ability to go in blind and find out everything for myself.