It's in reference to China's President Xi Jinping, who the internet said bears a resemblance to Winnie the Pooh. Memes were made, dictator got mad and censored Winnie the Pooh in China. Having a Winnie the Pooh avatar is basically a middle finger to China's censorship.
Did you know that Green Eggs & Ham was written off of a bet? http://www.realclear.com/books/2014/04/21/green_eggs_and_ham_was_written_on_a_bet_6519.html