I should begin by saying I have absolutely no training in this area except an AS level in Psychology and various reading that I happen to have done out of interest. But for me it points more strongly to evidence of social conditioning.
If we know that girls are generally socialised that outward displays of anger and aggression are frowned upon and that it is more acceptable to cry, indeed, this can even bring you more sympathy and better results and is shown in various media to be the "secret weapon" that women have in order to manipulate, or totally unavoidable because women are softer and more caring. And we know that boys are generally socialised that crying and anxiety are considered weak and unmasculine but that physical fighting and aggression is something natural and expected and "boys being boys".
If we know this is the case then we can deduce that a girl who is faced with a situation she does not know how to deal with is unlikely to react violently but more likely to become anxious or upset about it. Whereas a boy who is faced with a situation he finds intolerable is more likely to explode because this is the way that he has been taught his feelings are acceptable. If girls explode, they do so at home, with their families, where they feel safe. Boys are given the message that it's expected for them to explode when they find something tough so it is more natural for them to have that reaction.
We know that parents do this, even unconsciously, with little babies who are too young to know what gender they are and who act identically.
If we know that girls and boys experience the same typical childhood problems (for example, school work being difficult, being told off, or being rejected by a friend) but tend to deal with them in different ways then it makes sense that when the problems they experience are greater, that doesn't magically erase all of the conditioning, they are likely to deal with these greater problems in different ways as well. And it just so happens that the "boy" way of dealing with problems is more immediately noticeable and far more disruptive to other people, so it is immediately considered more of a problem.
We know that "tomboy" type girls who spend more time in the company of boys and consume media more aimed at boys are more likely to present in more male-typical ways. And the way parents think about emotion and children is changing, it is becoming less acceptable to tell boys to stop crying and be a man, so perhaps we will also see a shift in how different disorders present but I think it will be a long wait as the media has not changed, and the vast majority of the gender based socialising we do is entirely unconscious.
In fact perhaps it doesn't make a difference whether it's brain-wiring or nurture which causes observable sex differences, the problem is that we assume conditions such as autism or ADHD are so defined by their symptoms that we are forgetting that people react to situations in different ways, and one of the most marked and easily observable differences in behaviour happens between gender lines.