The vast majority of boys settle in very well at school though - it's only a handful that become disruptive.
I'm having similar problems in DD1 class. She's Year 4 and according to most teachers at the school - this Year Group has been the worst by far to teach.
The stuff that goes on in DD1s class is awful - DD1 has been stabbed near the eye by a pencil, her work has been destroyed on numerous occasions, a pot belonging to my mum (she got from Greece) that DD took into school when they were studying Ancient Greeks was hurled against a wall.
On a daily basis, the teacher is called a "fing b", s*, wh**". She sends the kids up to the Headteacher who then gets called the same things!
On the other hand, I feel sorry for these kids. One of the lads involved is chucked out of his house daily and is allowed to wander the streets until 10pm. Another 2 of the kids (twins) are regularly called various names by their parents (friend lives next door and I've heard the things they called them).
I regularly help at the school (4 times a week), but only going into Years 1/2 and Reception. The behaviour of the kids in these classes (both boys and girls) is perfect. They're polite, helpful and an absolute joy to be with - particularly the Year 2 groups (actually my favourite Year Group).
I wouldn't say it's just down to the Education system - their home life plays an extremely important part in their behaviour at school.
NB - My post above is not talking about SN children.