Unless the woman is a socialite hosting lavish parties all the time, she's almost never wearing heels because they're painful after long-term use. And even if she has to wear them for work, her partner isn't going to be at her workplace. The only time most women can justify wanting a tall guy in order to wear heels is on the weekend when they want to go out and party.

And since most women only wear heels on Friday and Saturday evenings, that still leaves a hell of a lot of time when they're not wearing heels with their partner, who could likely be taller but more importantly a good match for her in ways that isn't dependent on his height.

Saying "I want a guy over 6 feet because I wear heels" is like saying, "I can't date you because I care more about those few hours on the weekend than the rest of the time we're together", and women who think like this are the ones who really need to grow up.