The reason it comes off as sexism is because hardly any one mentions Jeff Williams, the guy who is actually responsible for inventory. And blames Angela, the woman responsible for the Apple Store. I'm possibly being thick here, but this seems like an inventory problem, not a store problem. If she had more of them, she'd sell you them, that she doesn't has more to do with Jeff than her. Yet she's getting the heat. So then you have to ask why, sexism is an easy, and in my opinion correct conclusion to come to.
again, no one in the thread mentioned anything sexist. they are angry at her (position/title or retail tactics or exclusive stores), wrongfully or not, that's open for discussion. not accusing our anger for being sexist.