In the society we live in, assuming the worst of men in the back of your mind when you present as a woman is not a case of paranoia or an irrational phobia, it is a basic survival skill. I'm not saying that all men are dangerous or pigs, but statistics can't be ignored. It's better than going in assuming they're all decent human beings and finding out they aren't the hard way.
Statistics are being ignored. Violence is not equalized geographically, nor in terms of class/social standing. Though some people live in constant fear, there are large amounts of people who live lives with little to no fear. Down on Turk and Taylor I don't trust anyone (outside of my crew). Not the men, not the women (1/3 harmless, 1/3 crack/drug dealers, 1/3 drug addicted whores), not even the police - because the cops don't need you / and man they expect the same. I'm hyper-aware at all times and I try to know where everyone within 10 yards of me is exactly and where they are moving to. Nothing is more conducive to getting in trouble than walking around dazed and confused.
But hey, get me back in Sonoma Country, West Sonoma County in particular, and none of that stuff is in my head - not even anywhere near it.
Parking lot of a concert two hours after the show is over can be bad, research library at a major university, not so much. Mostly it has to do with being alert and being aware of where you are and knowing that all things are not equal. All men don't act the same, and in fact, few act the way you depict.
I strongly recommend self-defense classes - there's a bunch of good videos on youtube if you can't afford them too. Having the intimate knowledge that you could very well defend yourself should the need arise gives a tremendous boost of confidence
Me too, but in order for them to work you really have to work at it - hard - for a long time. Sure you might get a trick move in on some drunk fool, but against any real thug you better be practicing it at the same level and rate your attackers do if you hope to come to a draw. And skip the video, anyone you could defeat by watching a video could have been defeated without just as well. Self-defense works only if you do it seriously, and constantly.