Not all guys,only some.Think of it like Schrödinger's box.You don't know if the guy you're about to get in a game with is one of those guys or not,so it's easier to just remove the box (the guy) from the equation to remove the risk.That's not to say women don't harass other women,but the type of women who have a problem with women are not likely to join an all-women clan. Most of us are in multiple clans anyway,so it's not like we never play with guys.Sometimes girls just want to play with other girls for a change,is that so wrong?