Again, I'll except trailers for thrillers and the like, those story structures necessarily depend on twists or slow reveals for their ride to be fun or interesting, and a spoiler can absolutely ruin them. But action movies?
> I'm not going to go around telling the plot of a movie to people (that's a dick move)
I have let other people decide what they care about. I'm just voicing my opinion about it. I'm not "spoiling" anything here. And, fine, my opinion is that anyone that cares about "spoilers" has first world problems. I have been yelled at (literally yelled at, like I'd just punted a puppy across the room) because I said something as obvious as "The Titanic sinks in the end", and often from movies of similar vintage.
Seriously, don't read reviews, don't watch trailers, and don't ask people their opinions of movies if you don't want "spoilers". Most of us aren't dicks, we won't go around telling you what happens in a movie unprompted (at least, not a recent movie, maybe as a way of explaining our references to older movies).
If someone wants to go to great lengths to avoid everything then that's fine. If people want to warn their fellow "blackout" fans that's fine too. If someone wants to say something isn't spoilers and it's just an action movie then, uh, ok then, I guess.
Spoiler alert: Everybody will die eventually. That doesn't mean the journey from birth to death is pointless now that you know the outcome. Everything that happens in between is the part that matters. The same is true for good stories.