On a related issue, Caroline Flint (MP) on the BBC politics programme today blamed a lot of the Brexit fall-out on 'willy-waving' by men. (I'm not sure - for obvious reasons - that there's an equivalent sexist remark that could be applied to women but I bet if there was one and that it had been...
She's played the 'sexism card' i.e. umpires/the authorities give women players a harder time than the men. She might have a case but even if she has, it was still a vile display from Williams and the crowd alike.