"Gender roles" seems obviously institutional. Who exactly assigns them, and why would it be silly to say that the portions that aren't clearly biological are likely sexist?
Are you saying it’s not clearly biological for men to behave differently around women?
That it’s not clearly biological for a man to place a high priority on seeking a woman for “individual sexual or romantic gratification” in a way that can cause him to view other men as competitors at the expense of “group loyalties and shared destiny”?
That it’s not clearly biological for a man to place a high priority on seeking a woman for “individual sexual or romantic gratification” in a way that can cause him to view other men as competitors at the expense of “group loyalties and shared destiny”?