This wouldn’t be the last time that someone unbraided a Pope, either. Not by a long shot. My favorite story is that of St. Catherine of Sienna, who basically told the Pope of her day to quit being a coward, and get off his duff and do what was right by the Church, which meant leaving Avignon and French politics behind and moving the Chair of St. Peter back to Rome, among other things. Her courage and insistance changed the course of history, and most especially the face of the Church in Europe.
Such events don’t detract from the Papacy at all, but rather further emphasize its centrality and importance. In a very real sense, the Papacy is bigger than even the Pope, because it’s the focus of unity for the whole Church. For this reason it’s in the interest of all of us to work for its right-operation and holiness, and sometimes that means taking a Pope to task for the sake of the Papacy and the Church. St. Paul did the right thing by challenging St. Peter for the scandal he was bringing to the Gentiles, and St. Catherine did the right thing by challenging Pope Gregory XI for the scandal that he was bringing to all of Europe. None of these incidents involve false teaching, of course, though there are points in history where Pope’s have been challenged, sometimes posthumously, for not being clear enough about such things.
The Papacy is the gift to the Church, not to the Pope
Peace and God bless!