Rage is such an inherently feminine trait and living with the subtle jabs and taunts at your mere existence should be enough of a reason to feel that anger. A woman who isn't angry is either submissive of her mistreatment or apathetic, both of which are not qualities I would want in friendships. So this is a rule I abide by. I may not necessarily only befriend people who explicitly call themselves feminists but i trust angry women more. A girl who cannot stand up for herself wouldn't do a great job at defending her friends, I believe.
