Pointing out shitty behavior is systemic doesn't absolve the person of their responsibility for that behavior. It helps illustrate the issue is systemic and not just some crazy one off occurrence. It also gives an angle of attack on solutions to the systemic problem.
The patriarchy is just as much a men's lib issue as it is a feminist issue. The gender roles and hierarchy harms men. Women being shitty to a guy for expressing emotion is an example of just that.