I posted spoilers for fun when Avengers: Endgame came out.
I am very displeased to hear this. Why would you post spoilers?
I was bored then and I also didn't want people to fall in love with the characters.
Though you might think it's harmless, It's actually wrong to post spoilers online as it can negatively affect how much people enjoy seeing a movie. It's not appropriate to negatively affect others just for your own amusement. Rather than trolling people and posting spoilers to popular movies, try to find ways of having fun that do not have a negative effect on others.
Okay, maybe I won't do it again.
I am glad that you're not doing it again as spoiling things make it significantly worse for people to see the movie and you don't want it to be done to you, right? There are a lot of groups on Reddit that you can join that you can discuss the movie with other people who have watched it as well, and you can say whatever you want there.