IN MY OPINION:
Women do not have any more trouble with ground work than men do, nor does a man value their relationship with their horse any less than a woman does. What women tend to do is nag a horse or nitpick instead of backing up their request with appropriate measures. Men are more apt to ask, tell, then demand, which, IMO, is what should be done. Training is really nothing more than putting meaning to an action, cue, verbal command, etc. If a horse understands what you are wanting, but chooses not to comply, and you continue asking over and over, then you have taught the horse that the cue/command, etc. means nothing and should be ignored. This horse isn't being aggressive, lashing out or demanding you "stop it or I'll make you stop" she's just doing what she's been taught and that seems to be ignore certain things you do/say. Repeated asking without compliance will teach a horse to be stubborn.