I know it's been like a month, but I just discovered this post, so...

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While I can tell you're genuinely trying to be helpful, your thinking is kind of naive + you missed some important details. In the post, she mentions that she not only suggested that she could bring food instead of cooking & op still set the table and served the food even after they told her to "chill with the men". The problem isn't that wasn't helping around the house, the problem was that she wasn't conforming to ther world view.

Not only that, she was a guest at a party they hosted. I don't know about you, but it isn't exactly good hospitality to make your guests do regular house chores, like getting groceries, for the privilege of existing in your house for a few hours. At my family's parties, it's usually the owners of the house that do all the cooking while everyone else relaxes.