Two things are most definitely true about women. They are NOT inferior in any way but they are very different from men.
They are treated inferior by many men but by no means all. On average the differences are very set, though there are crossovers of course in traits and abilities, just as it is with other animals. Where I think it is massively different in humans is that their intelligence - or in many ways a lack of it - actually leads them to believe women truly are inferior. The sad part of this is that some women also believe it.
Of course as men and women we will always treat each other in some ways differently. That is part of the animal/human condition too. But where one treats the other in some inferior fashion is where a lot of life's evils come from.
As in most things in human life, the sooner the differences are accepted between genders, ages, sexualities, creeds, colour and disabilities, the sooner true progress will be made toward no-one being thought as, nor treated, inferior in any way.
We can hope...