It's nothing major, not the same way Robbie Lawler and Rashad Evans' return to form was overlooked, but it is something I've yet to hear anyone address post UFC 167. Even though St. Pierre was rocked in his return to the Octagon by a Carlos Condit head kick, speculation by anti-GSP fan bases have led to a consensus that St. Pierre cannot take strong punch.
Whether or not one agrees with the decision in UFC 167's main event one fact remains: St. Pierre lasted five rounds with one of the heaviest hitters in his division, while also being hit more than in any fight he had ever been in before. He was hurt at various points, sure, but he didn't tap to punches (ala Serra's first title fight with GSP) and he also never stopped fighting for the win.
Despite whoever you think maybe should be champion now, the remaining fact is that Rush has a better chin than most thought, and more heart than people sometimes give him credit for. He's been a great champion, and even if he retires or loses the belt, he's earned the respect of the fans whether or not they choose to give it to him.