I've heard of "sore losers", but these guys are "sore winners". Maybe they've figured out that what they won was really the booby prize.
Oh, I forgot, they are Communists, they don't have to make any sense. After all, their whole theory of government and society is based on ignoring fundamental human nature, be those humans, Russians, Chinese, Vietnamese, or Americans of various ethnicities, so they are used to ignoring reality.