Men are women are different. Women are not inferior. Women are fully capable of taking on traditionally men's jobs and men can be fully capable of taking on traditionally women's jobs. No one is superior nor inferior. Men are women are simply different but that does not mean we do not have similarities.
Therefore, in order for women to be "inferior", you would literally have to argue that the female gender is inherently of lower quality.
Unfortunately this is impossible. Neither gender is inherently of better or worse quality, considering the huge diversity in the human race. We can all admit that there are some pretty stupid people (both men and women), but there are also some very intelligent ones as well. There is no hard and fast line of "This type is better than that type" because there are so many different variables at work.
The same argument can be made for race, religion, and a bunch of others. But that's an argument for another time.