It is generally understood in my world that boy babies are much harder than girl babies, but that girl adolescents are much harder than boy adolescents. And I found this to be the case, though my males still probably give me a harder time than my daughter ever did.
Honestly, school is hard for boys. Our ideas about institutionalized education needs a compete overhaul. No child should be subjected to what is analogous to an adult's full time work day at the age of 5! That is crazy. Many adults don't even work a FT job, yet we expect our growing children to endure it from the ages of 5 to 18, and beyond for college. I think it is cruel and unusual punishment, and some day our descendants are going to look back at this and be like, "Woah, I'm so glad I didn't live back then!"
Cooperative home schools, I believe, are the ideal model. With plenty of male role models (school teachers are predominantly women who need a quiet and controlled classroom) to take the kids for outings and field trips, but still be expected to do some book work and know how to mind and sit still. After all, just because males might be by nature inclined to war and battle, most of the instinct is unnecessary in our world today. Humans are higher-minded being made in the image of God and that needs to be fostered, while not losing the innate nature of what makes boys boys and girls girls.
Also, there is a (learned) burden on fathers to make their sons successful in the world. It depends upon the culture the father himself was raised in. No father wants to see his son--and his seed--fail! So they might be inclined to toughen them up, and mothers follow suit, all for wanting the best for their child, not out of maliciousness but benevolence.
A healthy, well-rounded group of parents will nurture the nature of the child (not sticking him in school all day, nor disallowing him to act out his feelings age-appropriately), while guiding the boy into being a successful man capable of raising a healthy family himself someday.
For the majority of men who fall through this gap in their upbringing, they will have many emotions that need to be expressed. That is only really able to be done in an environment of love and unconditional acceptance, such as might be found in a marriage or a healthy family, or a spiritual family. Where people are not afraid of the emotions of men.
By the way, Jesus said, "Live by the sword, die by the sword," so the Spartan way of teaching boys to be avenging warriors first and foremost is not ideal, nor is it Christian. But it is a primary tenet of thought in schools of terrorism.