And no, I'm not minimising the suspicion of a black S African to a white S African. My (black) DD was told - openly, in front of me at the age of 4 - that 'girls with brown skin can't play, only girls with peach skin'. She has experienced racism that you (probably) can't even begin to imagine, and as her mother I desperately want to protect her but can't. I can only help her understand why so much of the world is brainwashed about brown skin.
That doesn't mean she is suspicious of white people. The person who loves her most (and, at present although the teen years are approaching! loves most, is white).
I am very sorry that any woman feels uncomfortable in a mixed dorm. But the reality is that this is their preconceptions, and their choice to avoid. Not that all men are predators.
As I have said, this is not from someone who is lucky enough to escape sexual violence. But I have been lucky enough to have a brother who is safe, and male friends who are safe. Not every man is a predator, and I don't think we do each other any favours to behave as if they are.