The fans are in shock, but they boo their own team off the field for getting whooped. As if the athletes deserved not only to lose, but be hated.
Fan logic.
Makes me not give a damn about any of them.
Maybe, just maybe...when you live in the low-to-middle portion of a third-world just-this-side-of-the-17th-century society, and you have nothing in your life that gives any indication that the future is ever going to get any better, then you live in the fantasy world that is presented to you, and it (in this case, "futebol") becomes your vicarious route to a sense of personal worth. Except that you have no control over it; when the team wins, you feel wonderful, and when the team loses, your "futebol" world is shattered.
In the US, you don't see it in sports so much, but you do see it in entertainment. (cf. "Whitney Houston," "Michael Jackson," "Elvis Presley," "Marilyn Monroe")