I may be wrong, but I sort of feel like women are less subjected to 'fanboyism' (hence the 'boy' part of it). I think most women are more open minded and less aggressive about what they own, or switching brands.
It's not that men won't switch brands, but it seems like a lot of.... well, immature men anyways, feel the need to justify the brand they own by putting down all competing brands. It's the 'Alpha Male' syndrom. It's like saying, "check me out ladies, you want me because I'm the best. I make all the best decisions, I do everything better than these other losers, I'm the choice you want".
It's hard to watch sometimes. Because it makes us (males) seem so pathetic.