Talk about your instant karma ...
Recently I witnessed a guy who appeared to be coming on to a barista at Starbucks, arguing that 'surely you have 15 minutes.' She was responding with very good humor, which I would not have been. It continually amazes me the extent to which (some) men can interpret anything a woman does as interest in him, as well as the extent to which many believe they have a right to pursue a woman, stare, look her up and down, etc. I also find this doesn't really disappear with age

I don't think it's the initial move that's necessarily out of line, it's when they get a message to back off and refuse (a la Starbucks guy) that's really irritating. Have some consideration for women as human beings ... we do not exist for your entertainment.
I also knew a guy who called women who rejected him (in perfectly fine, not mean ways) nasty names, and just became furious. The sense of entitlement, and also complete lack of understanding of how this whole thing works (i.e., some people will be interested in you and some won't, doesn't matter who you are), is just mind-boggling to me.
In my experience, you can project a bit of armor on the street that prevents a lot of this, but at work, like the barista, is where you're really trapped.