In that case I guess my trouble with your point of view lies not with the "at some point" phrase but rather with the generalization implied by "any discussion". That argument is almost always used against people who complain about spoilers, and sadly it's often insultingly non-understanding. I'm not saying that all discussion are spoilers. While my personal wish is to not know anything about a movie before seeing it (which I have never regretted afterwards, by the way – the opposite, having advance knowledge, has not hurt the experience always, but it has never ever improved it), I realize that this is hard to achieve and requires me to take care of that, not everyone else. As you mention, that would impose too much of a burden on everyone else.

But that does not mean there is not still a lot of stuff that really should be considered spoilers, and the complaints about these should not be brushed off just because you think I expect you to not mention anything about a movie. I think it's a very valid criticism when the article in question reveals something that even the trailers kept unknown by never showing that person, without any need for it in the context of the article. It's like saying "The Sixth Sense, where he was dead all along, was quite good, I loved the cinematography." a week after that movie was released. While I personally would not have wanted to know about the cinematographical quality either, I realize I can't complain about hearing something like that when reading a review or when I'm not fleeing a discussion of the movie quickly enough. I never would complain about that. But I'm sure I'm not the only one who would be pretty annoyed to read said plot detail in an article about e.g. "The decline of quality in M. Night Shyamalan movies" a week after that movies release.

To sum it up: I agree with your basic point, but I think too often people that are fine with spoilers don't care about the fact that other people have a different level of acceptance and when confronted with that simply resort to saying "Well, it's silly to have this level of acceptance."