For someone to say that blowout means a team don't belong in this or that league is an idiotic statement from someone who never played sport.
Blowouts happen all the time in lowest and highest leagues in the world in ALL sports. Sometimes, because one team is having a great day and the other team don't, or a team have their star players injured, or it could be a bad call that changes the game. There are a lot of reasons that this can happen. Arsenal lost 0:5, so does this mean they don't belong in Premier league? Some may say it's a true statement though