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For men it is because there are so many non disabled women, that people assume you would only date her if you are too desperate to get anyone else to go out with you. I have mentioned before that I would be willing to date a disabled person and have been mocked in this way for it.
For women they simply place a higher priority on a man being independent and strong enough to make her feel safe. This is the same reason why women like taller men. It makes her feel protected to be with a physically capable man. I have heard women say this as well.