It's just that, often, people discuss movies here without spoilers, or put the plot discussion further down the post with a spoiler alert, so when I clicked on it, I didn't realize it would be in the first sentence like that. I was hoping to find out what other people thought of the movie, since I've heard very mixed reviews.

So yeah, technically it's my fault and the OP didn't do anything wrong, but I thought a spoiler tag might be courteous to add so no one else ends up like me

And yeah, you shouldn't need to add them to discussion posts after a certain period of time. But this movie just came out.