Most women make it clear that they like short guys, but being the ego maniacs most short guys are they STILL go after these women. I mean, who do you have to blame but yourself? Also, i can tell you for sure that not all short guys get the boot, I know plenty of short dudes with enough game and personality to get a woman who prefers guys 6'2 and above, and when they can't they don't complain, they move on to the next.
Big women can lose weight, there's not much short guys can do to improve their situation other than invest in some timbs or something.