Why is it some men get all offended if a woman they don't know is wary around them?

[H2O Man]

223. Oh, that's simple:

Some men are assholes. This includes several sub-groups, such as flaming assholes, stupid assholes, etc.

By no coincidence, some women are assholes, too. More, the female sub-groups, while not "exact" to those of the males, include large areas that actually overlap.

It is important, at least in my opinion, to recognize that even good people can (and do) say or do stupid things, from time to time. For, in the end, we are all sad and weakly human.

In the example you provided, we can determine that this fellow did not have what we know as "boundaries." For better ow worse, we can really only speculate on the reasons for his behavior. He might have intended no harm, and merely acted like a fool. Or, he might have been an asshole of the flaming variety.

Either way, we can conclude that you responded in the appropriate way. That, of course, comes as no surprise to me: for you are an intelligent human being.