He's not that bad. He's been criticized here by people from nations which have not even qualified, or left much earlier than Brazil.
He has amazing qualities as a coach, and he is human, so he has the right to be pissed off with that team that has not been accurate when shooting to the goal. Questionable substitutions aside, he's been a very good coach and even gathering together a team with people who think so differently (i.e., douchebag Neymar and Richarlison) without internal fights is nothing short of a miracle.