Nobody is arguing that Crowley doesn't present as male--and is referred to using he/him pronouns--for most of the series. Some of us are arguing that the times Crowley presents as female indicate something important about the character and are worthy of exploration in a femslash exchange. I can't speak for everyone, but if I were to write Crowley-as-Nanny-Ashtoreth, or Crowley in Judea, or Crowley-presenting-as-female-at-any-other-point-in-history, I would certainly use female pronouns for her in those fics.