No thats still by defintion stupidity.That's not stupidity, that's ignorance.
That's ignoring info you knew about, but if you missed it, then it's totally ok to be disappointed. However, how you react to that disappointment is what defines it. If you are disappointed, but in the end are ok with it, then fine. But if you stay annoyed, then that's actually dumb
I dont want to call anybody here stupid or anything but the failing of one human being to read doesnt make their disappointment in the game a valid critice.
Someone saying that this game has no penguins and needs one asap because they somehow missed the fact that there are 3 penguins in the full game allready, might not nessecarily be stupid, but their opinion on the subject is defenetly invalid and does not deserve any consideration until they are actually dealing with the real facts.
Who knows if they still have the same opinion when they know the truth.