Patriarchy is first and foremost a dominance hierarchy. The historic power differential between men and women is only one aspect of that. A culture built on violent domination of anyone you perceive to be weaker as a way to rise in the pyramid of power leads to all kinds of problems. Social isolation for men is certainly one of those.
Patriarchy Demands Constant Ranking and Stratification Of All Kinds
Not just between men and women
Thanks for your thoughts.