Your comment pretty much sums up the prevailing misogynist attitude that gives rise to the kind of workplace culture Susan Fowler is describing.
> if that didn't help, I might contact her husband as a retaliation
I honestly can't believe you wrote that. If it was an exact replica of the scenario with the genders reversed, the husband probably wouldn't mind anyway (well, maybe would be bothered by the inappropriateness of it, but open relationships are open relationships and you can't assume the husband would think that it was a bad thing because you don't know what his idea of relationship ethics is), but your response to workplace harrassment would be to harrass their spouse instead? Not to go through HR? On a purely practical level, can you imagine working on that person's team after you'd done something like that?
> Is it a female-thing to take these sort of situations so seriously, or maybe a personality trait?
Okay. Imagine that you turn up somewhere to work. You've got your tech skills and your experience and you're all ready to go. Then your manager's initial interactions with you makes it quite clear that she views you as a prospective sexual partner. She's not got to know you first, you've not had time to demonstrate your professional capabilities to her, she's just propositioning you out of the blue. Would you really not find this problematic?
Please bear in mind, being female in US and British culture can be pretty unpleasant at times, with a continued attitude held by a lot of men that it's perfectly okay to proposition strangers in the street in loud voices, or shout suggestive comments at them, or demand "just a smile, love" or a conversation like it's their right to have a conversation with you, or that you _owe_ them a conversation. Imagine you're a woman in the tech industry, where women are chronically under-represented.
For you or me, as men, we might find such an incident as this slightly novel and interesting. If we've spent our _entire lives_ dealing with unwanted and unsolicited sexual advances and comments and innuendo, with media representations of our gender as little more than objects of male desire, and then we get such comments, can't you imagine that we might just feel a _little bit fed up_?
FTR I'm a gay white cisgender male living in England, so I'm still doing this on 'easy mode'. I've encountered almost zero homophobic behaviour in the workplace, for which I'm very grateful. But I've also always worked in companies which made explicit statements about supporting equality and diversity, and in a country in which it was made illegal before I started my professional life to discriminate on the grounds of sexuality. I've not had to test that legislation, but at least it is there, and we also don't have at-will employment.