One possible argument to make is that there is still gender inequality. There are many statistics to show this, in government and in big business, for example. You might also include what is called anecdotal evidence, which means providing examples of situations in which women have experienced this sort of inequality.
An argument can also be made on the other side, that women have gone beyond equality in some ways. I believe a majority of the wealth in the world is held by women, and there are statistics showing that women hold more college degrees than males, have a higher rate of high school graduation, and probably exceed men in a few other measures, too.