What I question is parents throwing common sense and caution to the progressive wind, hellbent on augmenting and embracing a sudden, omnipresent and obvious agenda pushed on children often not even old enough yet to transition from Duplo to Lego. Most kids roleplay, whether "identifying"as the local neighbourhood dinosaur, a goldfish, a princess, a Ninjago or Pippi Longstocking and endlessly on (Calvin and Hobbes, anyone?). But they're kids, they grow out of it. Or become artistic adults
We don't actually know that Shiloh "identifies" as a male. She's been dressed/allegedly dressing as a boy since very young, maybe she is one of the extremely few humans who biologically are born in/with the wrong sex. Or maybe she just has a mom on a political mission. Or who prefers sons to daughters when they resemble herself or for whatever reason. The fact that Shiloh's younger biological sister is now exhibiting the same kind of behaviour (after dressing very girly-ish when younger), while their adopted sister is not, is somewhat striking.
Because yes, I do believe it credible that someone like Jolie has a saviour complex and would consider her biological kids to be more privileged than her adopted kids and treat them accordingly. I'm surprised she had biological kids at all. Wasn't she going to create her own family-UN of kids?
And secondly yes, I think there could definitely be something to what threadbender and others have pointed out. Some mothers don't take kindly to being outshone by their daughters but would rather their daughters suppress their femininity. But more likely, some mothers simply don't like themselves or are insecure and this, I guess, is easily mirrored and embodied by their children because children pick up on these things. Or they're prompted to.