Do you think that Sharapova's squeals are pretence?And what about Nadal and Djokovic's extreme fist pumping?

players like sharapova squeal a lot,even the williams sisters. Male Players like Nadal,Djokovic too give out grunts,especially Nadal. With every shot,he grunts,whether it be a simple slice or a forehand. But we have seen that Federer hardly lets out grunting sounds,neither does he pumps his fit over'aggresively like Nadal. what do you think?