In the absence of a pretty significant set of circumstances, there's little chance I'm going to see the movie. The last MCU movies I've seen that weren't Deadpool (because let's be honest, those movies are definitely different) were bitter disappointments with a bar already set low. Again, excluding the Deadpool movies, the last one I saw was the first Avengers. As such, nothing was spoiled for me.
What bothers me most has been the offhandedness that's ensued since the spoiler.
I mean...I may be in a small club here, but the first response to objections to the spoiler being a straightforward apology--"Hey, I apologize. It slipped out."--would have been perfectly acceptable to me. Though, like I said, nothing was actually spoiled for me.
But no. What followed was the apparent (and repeated) implication that the blame for the spoiler lay on the shoulders of those who haven't seen the movie yet.
Oh, and, "don't read it if you don't want to know what it says"? Are you serious?