I Accidentally Spoiled a Comic to Someone and Feel Bad

I was on Reddit and in a comic group, saw someone asking if, "Kraven's Last Hunt," was a story worth checking out, and if they needed to read anything else to understand it. I commented it was a fantastic story and Marvel should have let Kraven stay dead afterward instead of bringing him back (he dies by suicide at the end, having defeated Spider-Man in a fight and thinking he accomplished his goal of being the best hunter ever). They commented something along the lines of, "Oh, thanks for the spoiler, I guess," and I suddenly realized, despite the title and the fact that the story is decades old, they didn't realize what happened, and I'd wrecked any surprise. I felt bad, even though one could argue that when a movie/comic/show has existed for years, folks shouldn't be surprised to stumble upon spoilers. The thing is, I kind of made them trip over the spoiler by putting it right in their way--to stick to the metaphor. 

I apologized, and they said it was okay. They still plan to read the popular Spider-Man versus Kraven story from the 1980s, which I would argue is the best Kraven storyline ever--they should've let him stay dead after it for real. Still, I do feel guilty for destroying any element of surprise. It reminds me of a film class where we all were assigned a popular movie to view and report upon. I picked, "Citizen Kane," as it was incredibly ahead of its time and still an impressive piece of cinema. I was going to discuss at the end of my report how the flick reveals what the mysterious, "Rosebud," mentioned at the start of the movie by Orson Welles' character is, but the whole class erupted in people yelling, "Don't spoil it!" Really? You all are going to run out and watch a movie from 1941, now, because my report got you so interested? 

In that situation, I was a bit amused by how reticent people were to have anything revealed as if they were going to go see, "Citizen Kane," right away. That said, the situation with, "Kraven's Last Hunt,' is clearly a bit different, and I am somewhat the bad guy in this case. I'm sorry, fellow Reddit user, I didn't mean to spoil it. "Kraven's Last Hunt," or, "Citizen Kane," are both worth checking out, however.