It's generally the nature of fans to be bandwagoners. It's a lot more fun to be a part of the winning side. I just couldn't help but smile how you drew a parallel to Warriors fans and gays.
As for the best stadium in baseball, I suppose deciding which is the best is relative. I've yet to see a Giants game at SBC Park and I'm sure the facility is nice, but there is no way, IMO, that it can compare to seeing a game at Wrigley, Fenway or even Yankee Stadium because of the atmosphere and history at those stadiums.