Some of it may be attitude. Others can read insecurity, which can be a big barrier to establishing solid relationships. I think it's true that many women have a bias against shorter men, but after getting to know someone can see that it was a shallow prejudgment. I can admit to stating a preference for men over six feet, but have dated men not even an inch taller than my 5'6" self. In the end, other things mattered much more than one uncontrollable characteristic.