But those statements aren't necessariily implying that they are fixed, biological, inherent differences, nor that they are going to be true for all boys or all girls.
It might be true that many boys are a handful, because of socialisation to be boisterous, rebellious, confident etc, and some of those expectations also mean behaviour that is challenging in particular ways.
And girls have a hugely complex and changing role in society, and are socialised in a way that can mean interesting friendship dynamics, conflicts between different expectations, etc., and thus managing their emotional and social behaviours could indeed be often more complicated than it might be for boys.
It doesn't mean it applies to all boys or girls, and it doesn't mean that it's an inherent difference between them, but sometimes things like that are a perfectly valid observation of what it tendds to be like in the current society for raising boys are girls.
So I think it's important to be careful not to read too much into what is being said, and to not assume that they are saying that boys and girls are fundamentally wired different in an unchanging biologically-determined way (in terms of behaviour and personality, obviously, not physically!). But in many ways, their experiences and socialisation does produce different challenges, and it's fair enough to acknowledge some common experiences like that (whilst at the same time, being careful to not perpetuate the idea that it's inbuilt, or that all girls/boys will be like that to the extent that people end up seeing what they expect to see).