The profile Babowa pointed to is, as far as I can see, the only 'non-pictorial' support profile available. It is a subjective judgement whether it shows the view seen from behind of a male or female, and is probably intended to be neutral. Not all posters wish to reveal what gender they are.
When you reach a certain level you can use your own avatar of choice.
There are actually three, one flat, one 3-D and one "group".
And it is really not using an avatar of my choice, so much as the matter of using the visual representation of the word "he" as a gender neutral avatar. And yes, traditionally masculine pronouns in the English language are supposed to be gender neutral. But supposing them to be so doesn't make them so.
Interesting though that people are much quicker to defend what is than consider any form of more balanced set of offerings.
So a counter argument: Why not a "gender neutral" avatar that might be female or might be a long-haired male?
But an interesting question: Why do you assume the image is seen from behind? Fair bet the image started as a mug shot from the front and was tweaked and massaged out to a gray neutrality, and it very much meant to represent, from the front, a generic male office worker ensconced in a casual office setting.
Though, to be honest, an argument can be made that gendering the avatar can be considered sexist either way, since it has to play on stereotypes to be recognizable. Thus the problem with a long-haired male, or a female with what appears to be a hairstyle I haven't seen on women anywhere outside of retirement homes or gathered around pool tables in select bars in the area dressed in red plaid flannel shirts with the sleeves rolled up. So perhaps the solution is to remove all evidence of gender: the cues to short, somewhat wavy hair trimmed to stubble on the sides (who knows, maybe it really is a mullet), the visual appearance of a raised collar (blouse collars tend to sit flat), and aim for something more abstracted.
Either way, the accusation stands.
The response was directed at Klaus1 who does describe it as the back of a head, though the analysis of the image does address your question as well.
As for time. Perhaps it is not that critical an issue for many people, I just expected Apple to be a bit more on the ball on this one. Suppose I should know better by now.
As for myself, I will keep providing a balanced selection of generic avatars in my own work. It is just plain good form.
Clearly, cleary it is a mullet!