Let's think about it :

All female gaming group :

-no we don't want male in our group, you male are all so evil and bad.

-all ok with that

All male game group : -don't exist

-"why are you all male? You don't know girls gamer?"

-femmists trigger in to the core

-"you are sexist!

-" what? You invited me? No tehheee I have MY GROUP OF ONLY FEMALE FRIENDS WHO PLAY AND NOT WITH YOU EVIL MEN"

Hypocrisy.