Jesus you're stupid. Or maybe just really young, I don't know. American sports is an extremely heteronormative institution where masculinity, in a very traditional sense, reigns supreme. Pro athletes in America are looked at as examples of "real men," and, up to very recently, this meant there was no room to be gay in professional sports. Had this happened 5 or 10 years ago, the athlete certainly would have been publicly ridiculed and abused for not being straight, and probably forced into retirement. It's a big deal because no professional athlete in America playing one of the four major sports (baseball, football, basketball, hockey) has come out as publicly gay before. It shows that our society has moved past the point where someone in such a public, traditionally masculine position has been able to admit to being gay without being run out of town by fellow athletes and coaches and the media.