Are nurseries/early years becoming too quick to claim 'behavioural problems' in boys

[Mog]

There are a few threads on boys in nurseries/reception who are being assessed for 'behavioural problems'. We're currently going through this with our third(ds2) because he is showing aggressive behaviour at times in nursery and won't sit for story time or join in singing. This seems to be the same in the other threads I've read.
How do people feel about this? Are we expecting too much of certain young boys - perhaps the ones like my second son who hate to be still and love exploring/taking apart/seeing how everything works. Being still is nearly impossible for him .First son was totally different. As for dd, I would have been a very smug person if I had only her .
Love to hear your thoughts.

I read something a while ago about there being a wide range of personality types in toddlers, far more so than in adults.

But you can't have such a broad spectrum of personality types in a group setting, so they begin to conform.

I think that school can be excellent for boys if the teachers are good, but otherwise it can be hugely upsetting and traumatic for all concerned - the teachers expect things that are utterly at odds with what the child's capable of and expects behaviour far beyond what is normal.

Girls, generally, conform more and younger.

And yes, they're wild generalisations and there are obviously conformist boys and girls for whom a more active style of teaching and learning is appropriate.