Joe is a loser. I don’t mean that in the colloquial sense. I mean it in the sense that he’s someone that will take a winning hand and turn it into a L without fail, every time. In fact, a loser will self-sabotage if they even think they are going to win (see: Joe’s rap battle foray). Nobody expects anything from a loser, but winning creates expectations. You have to have a certain character to win consistently. The movie the Hustler has a great psychological breakdown of the mind of someone like Joe. Joe was always going to fukk this up, because that’s who he is.
...and “everyone” knew it too bcuz that was always a running “joke” on the show and amongst fans “how is joe gonna fukk this up?”