Earlier quoted context omitted.
You're taking what I said a little too literally. Take a look at my response to another commenter where I clarify my hula-hoop statement: https://news.ycombinator.com/item?id=7408735
You're avoiding what I think is the better point, the first one. Her mistreatment by an estranged wife of a founder, in and of itself, doesn't constitute sexism. If her problems with this were ignored because she was a female, that would be sexism. But I didn't see any evidence of that presented and to me it seems more likely they were ignored quite simply because it was the wife of an important person at the company…
I think what the prior poster is trying to express is that this is a situation, with the founder's wife, that could only occur to a female employee. The covert power of the wife over the complainant is based on gender, and her success in intimidating the complainant with bizarre behaviour -- to which the complainant had an entirely passive response -- is largely due to the social expectations that the complainant perceives, that as a woman she should not be confrontational nor assertive.
Given that I didn't see the hula-hooping incident myself, and only have the complainant's description of it, I cannot adequately address the question of whether or not the men involved were behaving improperly, or aggressively, or in a fashion such that I am sympathetic to the complainant's feeling that their attitude was demeaning to her female colleagues. Personally, I could happily watch attractive young women exercise for hours. But I would also sympathize completely with a young woman whom felt uncomfortable with that. From the complainant's description, it seems that her colleagues were hula-hooping together for fun, and that there was an abnormal number of male engineers sitting and watching them. The hula-hoopers were presumably aware of this. It spoiled the fun for the complainant, but how the hula-hoopers felt about it is still an open question.
I think you are absolutely right that the focus of discussion should be the founder and his wife. The situation sounds completely inappropriate, the HR response seems powerless and ineffectual, and whatever the other side of the story is, her resignation/dismissal occurred under entirely improper circumstances, and she probably deserves compensation for this.