That's because it is true, that she says it best to the man when she says nothing at all or does this...
She can walk away, use body language, and looks and such, but she learns and grows best, and she's not supposed to try and teach him with words, anyway, and says it best to the man, a good man anyway, when "she says nothing at all", in that sense, there are other ways to communicate though, you know...
She should not stay with a bad abusive man though, some just won't learn by your (a woman's example) of submission, and will even use and abuse you...
But, a good man, that is really the best way to "say" it to him is what God, and Paul says... And will be showing the man respect, and a good man very much values and see's the kind of respect you show him, even and even most especially, when he knows he does not deserve it...
God Bless!