If you want a make a case against something, offering a value judgment is not of much use unless you provide the rationale behind it.
I wouldn't have thought the rationale of equality, individual liberty and personal freedom particularly needed reiterating, but if needs be there it is. That's why sex and gender segregation are barbaric, because they condemn particular parts of the populace to particular roles, excise them particular fields based not on who they are, but on someone else's determination of what they are.
At its most egregious you get the sort of nonsense we see in Saudi Arabia, where about half the populace are subject to the morality police if they don't get someone's permission to go outside, or if they talk to whomever they choose, or if they don't want to wear the headgear that their guardian has required of them. That's the worst case scenario, and although this level of segregation isn't at the same depth, it's still barbaric, it's still a remnant of an antiquated, outdated, outmoded, restrictive, oppressive way of life that doesn't have a place in the twentieth century, let alone the twenty-first.
O.