This reminds me of the thread about women exercising in the great outdoors and the sexist comments they endured.
Maybe Serena and Venus don't exactly fit the simpering, small, sexually available ideal of how men think women should be, and so there's a backlash against them as women.
Maybe women find them to be too good to be true and find themselves feeling inadequate against such competition?
Maybe it's just racism plain and simple?
Who knows- it's probably a combination of all three.
I think they're wonderful. As I do all sports women and men actually, even Pippa.
In a way the backlash reminds me of the racism against Nina Simone- considered too black to play classical music and refused further education because of the colour of her skin.