Because everyone ever has never goofed at a game, if they don't know how to do something it's because they haven't played the game through already, not because they can't figure it out, of course.
No not really sometimes even the best gamers miss simple things, nothing to be ashamed of.
But you can't really expect to miss something that a majority of people don't and not expect some sort of reaction, can you? I've done worse to be honest, in these situations it's reasonable for people to be like "lol u dumb".
i mean this is the tutorial boss of a childrens game were talking about