Earlier quoted context omitted.
I was responding to the main premise of your comment, that "the fact that women shoulder the primary economic burden of raising children is structural sexism." This implies discrimination due to external forces that make men and women behave differently.
What do you mean by external forces? These are all interactions between human beings. We behave that we do in large part based on our interactions with others. Would you say that it is "external forces" that cause us two to communicate in English? What is the alternative position you're suggesting?
I think the effects of evolutionary biology need to be considered when looking at behavioral differences. Evolutionarily speaking, women invest much more energy into growing, giving birth to, and caring for children than men. This leads to innate differences in behavior separate from social forces you are describing.