Ok, I'm going to attempt playing the peacemaker (even though it's going to backfire horribly).

Yes, OP did jump to the conclusion that the men in question were seeking to subject me to a sexual assault, or at least contemplating it. In all fairness, I do believe he may have been correct about a few of them. Some of them just seemed stunned at my complexion (for context, imagine a blonde girl, as pale as if she'd never seen sunlight. Skin that'd make Snow White say "Jesus, girl, get on the sunbeds". You get the picture).

I don't believe the conclusion OP reached was inherently racist. I don't think he was entirely wrong, though I also think it's sad that anyone's mind goes straight to that possibility of gang rape. Perhaps that says more about our awareness of sexual violence and the real danger women can be in on a daily basis than it does about racism.