Guys, when the game is going poorly, there's going to be overreactions. People are emotional about the game and team. The shoutbox is a chat room with short sentences which captures a person's immediate instincts at that time, unlike a post which at least sometimes comes with some premeditation. It often happens the other way too, for instance in preseason after some great plays an unheard of player might be annointed as the next great.
Like fans of any sports team, Packer fans come in many types. There's the over emotional ones that live and die with every play, there's the ones that believe we're going to the Super Bowl no matter what and look past any flaws, and there's ones that see only the negatives and forget about the positives. There's ones that are in between, and ones with an apathetic 'it's only a game' outlook.
Always has been, always will be, and it's not just limited to this board. I don't know why people continue to be amazed by the overreactions of the shoutbox.