When you're the character that can beat all fiction, your legs get broken and the one who broke your legs wins the race "fair and square" so he mocks you with a catchy song about how Sour Grapes are the only ones that can beat you, and the fruit of victory and defeat. Then a green goblin man, Santa, Tooth fairy and a sticky man join your enemy to sing you Sour grapes.
This is a play on words. Specifically these words: "wine" and "sour grapes".
President Trump tweets a whole lot of meritless complaints about petty disputes concerning almost everything that displeases him. Some would agree his whine is made with sour gripes.