Why did people wear 'Winnie the Pooh' costumes during protests against Xi Jinping in US?

People wore 'Winnie the Pooh' cartoon costumes while protesting against Chinese President Xi Jinping during his US visit to mock him. In 2013, social media users had posted an image of Jinping with then US President Barack Obama alongside a picture of Pooh with Tigger. Several such pictures comparing Jinping to Pooh surfaced later, leading China to ban the cartoon.