Watch the video.
It means that you're out of your element and lamenting/complaining about the wrong stuff, missing the point in its entirety. Many, or at least some of us here, are long time Fallout fans. We grew up with Fallout 1, Fallout 2, Interplay, their shitty moves with Fallout Brotherhood of Steel (also known as Piece of Shit). People here have been Fallout fans for a long time. And we are discussing Fallout related topics. Just as how the Dude and Walter Sobchak have a discussion, and you are Donny, wandering in without a reference, knowledge or a whole picture about the story, like into the middle of a movie complaining about a specific scene, giving a totally unrelated comment.
Imagine it like this, a couple of your friends are watching Memento or Twelve Monkeys, and you're walking into the room at the midle of the movie, watching a scene, and complaining that it makes no sense. Your friends tell you to either shut up and sit down, or to get out. You tell them they are just talking shit. One of your friends is calling for his mom, and she throws you out.