I also think this is a really interesting topic and huge potential problem for world sports (and etc.)--that people don't just cheer for their own group, but set themselves against others, and attack. It was like an over-identification with the player, hanging on to them as if their accomplishments were your own, (you who have done nothing), because it was the "same group." Then when you have so many anonymous fans ready to attack for the "cause," as all of the idiots on this website who vilify women as "bitches" when no other group gets this treatment, and you have it escalating already.
It doesn't have to be that way, as the poster from Israel referred to: that because Anna Smashnova is the only world-class level player, a lot of people hope she'll win. As an American, though, the situation is the opposite: I sometimes get sick of Americans, and worry that people around the world get sick of us too. Also, Americans seem just ordinary to me, and I would rather hear from other people sometimes. A similar thing (potential problem) might be the "U-S-A!" chant. When I first heard that, years ago, I was horrified--it sounded so belligerant and obnoxious, threatening, like "Heil, Hitler!" and I thought of people hating us "shoving their faces in it" again, and every time it would start up, I'd think "Stop that goddamned chant!" It was so embarrassing and vulgar to me. Then a few years ago--I can't remember what event it was--I heard it go up again, but for some reason this event was so fun and positive that I heard it a new way, and got into the swing of it, so I knew that it didn't necessarily have to come from a hostile attitude. Still hate it, though.
It is harder to get people to show some real regard for others than for themselves, though: I recently tried to start a thread, Favorite Nationality (For Players) or something like that, where I deliberately did not want people to name their own, but to tell which one other than their own is their favorite (mine is Czechs). It got very little response, and only two replies, one of which did what I asked not to do, and named their own nationality (Spanish). Of course, there are many reasons why a thread doesn't take off.
One of the greatest things about women's tennis is all the different kinds of people there are, but sooner or later these things are generally made the basis of an attack.