You will have seen that there are a differences in life expectancy between people born in rich and poor areas (famously Calton was said to have a life expectancy of 54 - it doesn't). This is often described as an injustice.
You will have seen that there are differences between the incarceration rates for black and white people (in both the US and the UK). This is often described as an injustice.
You will also have seen that is a difference in life expectancy between men and women (about 3.7 years in the UK) and in incarceration rates between men and women (at the end of 2016, in England and Wales, there were 355 male prisoners per 100,000 and 16 females per 100,000 - i.e. more than 22 times as many men as women).
Pretty much nobody thinks the difference in life expectancy between men and women or the difference in incarceration rates between men and women are matters of injustice. (On the massive discrepancy in incarceration rates, it's not quite nobody, but near enough for present purposes. And some discrepancy is surely to be expected.)
You could say that this is just because the sort of people who worry about this kind of thing don't worry about it when it is men who are on the receiving end. But that would be too cynical. Surely it's just common sense to think that men die earlier and commit more (and more serious) crimes than women. These statistical differences do not call out for justification in the way that rich and poor or white and black people dying or being imprisoned at different rates are facts that call out for justification, explanation or correction.
All of which is just to say that we do not think that the sexes are identical or that all differences between outcomes in their lives are the result of injustice or special treatment. Those unfortunate egg-freezing women can at least be glad that they are not dead or in prison (although perhaps that's what happened to their potential mates).