I, a man, was a kid who never struggled in school. I was well-behaved, did my class work, sometimes did my homework, never got in fights, and rarely found anything tough. I was a good student. My teachers liked me. I liked most of my teachers.

My perspective "from the inside" was that everything was fine.

When I had my own kids, I began to see just how difficult schooling can be for many boys. Not all, but many. Modern school is essentially an effeminate undertaking and it's geared towards girls. Every year the percentage of male teachers K-12 decreases. This is why you often see girl children outperforming boys at a young age (elementary school and into middle school). Girls both mature faster and generally do better in the rigid behavioral framework of school.

Once you hit highschool and college, you see the boys starting to mature AND be able to be independent. This is when boys start overtaking girls in academic performance in many fields.

I think there's a lot to be said for gender segregated classes.