In case already told "Spoiler" beforehand but still got lot of 'thump down' then it's nothing related to 'like or dislike' spoiler at all. It's another hidden issues; conflict, jealousy or maliciousness. We have to see case by case. I know about this case more than anyone here.
I wonder why some people don't like (nearhate) spoiler. . . .????
I'm fine with it , (=・ω・=)