disagree
why spoiler tag : People discuss the plot so spoiler tag is necessary. to not ruined the enjoyment of other people. People even put their negative comments in spoiler tags so as not to offend fans of that content or their enjoyment.
users want spoiler: if reader wants spoiler talk then . I am a spoiler lover myself . Even if someone tells me the whole story from beginning to end, I don't mind. And there will be some people like me whose motive is curiosity to know what they are watching themselves without spoiling the rest of the user's entertainment.
user don't want spoiler : There are many users who communicate without discussing spoilers. Going to the comment section does not mean that they want spoilers. There are many things to talk about besides spoilers. So that those people can avoid it, hence the spoiler tag is necessary.
people don't use spoiler tags: are irresponsible when discussing something spoiled. For that, all you can do is report against either comment or the user.

Seeker of Truth:
"Hide spoilers" make reading others' posts more inconvenient and alot of times their comments won't even get read.
i don't think so . If you want to read spoiler then open it otherwise it is completely up to you.