What did older Somalis really gain from free-mixing with men? Didn't they all end up being hooyos who taught their daughters to be careful of men?
Women should be afraid of men, not all men, but a good chunk. If we consider the fact that most women have encountered perverts or know someone who has been assaulted, molested or sexually harassed by a man.
Ideally women and men interact with each other politely and when necessary, but the male gender has too many disordered beings for that to be realistic. Gender segregations/mahrem is to protect women from these kind of beings. Even when they are 'courting' girls, I think they need to be supervised, investigated and grilled by their own gender who can read through their bullshit.
Women are harmed more by men than they are harmed by wild animals, but we've been taught to think it's extreme to be careful of men, when our own creator, Allah SWT, has guidelines for how to interact with them.