The milk thing has been around for ages. From Wikipedia:

A long-standing tradition of the Indianapolis 500 is for the victor to drink a bottle of milk immediately after the race. This practice first began in 1936 after Victor Louis Meyer asked for a glass of buttermilk, something his mother had encouraged him to drink on hot days. Afterward it became a ritual as milk companies became sponsors of the race purse and handed a bottle of milk to the winner to promote their product. A sponsorship of currently $10,000 now paid out by the American Dairy Association if the winner swigs the milk in victory lane. Among Indycar drivers, Emerson Fittipaldi is infamous for drinking orange juice instead after his 1993 victory, before he drank the customary milk. Fittipaldi owned citrus farms in Brazil, and wished to promote his industry. He was promptly booed in driver's introductions the following week by the crowd in Milwaukee, Wisconsin, in the heart of "America's Dairyland."

Kanaan got knocked out while trying avoid his team mate and young punk, Marco Andretti. He swerved to get out of the way figuring better to take out someone else than two cars from the same team. He ended Sara Fischer's race aswell. She apologised while he did too, then he siad he was not very impressed with Andretti, who is going to cop a Kanaan special to the face after the race.