Tennis impersonation

I was reading that Caroline Wozniacki was being accused of racism when she impersonated her friend Serina Williams during a exhibition tennis match. The feminist group that reported this as racist stated that because she represented Serina in a hyper sexualized way, with a big ass and a huge chest, she was  making fun of the community of black women. This is completely absurd to me, first off Wozniacki and Williams are friends and Serina laughed at it when she saw it later that day. Just because Wozniacki is white an was making fun of Serina who was black does not make this a racist statement in any way. This is just someone trying to make a story out of nothing because they have nothing better to do with their time.