I've had to change school a few times due to bullying. Thus my experience was the opposite: the worst bullying I endured was when I was between 9 and 12 years old. High school was mostly fine, and most of the people that I met were fine, although I had to deal with a bit of homophobia.

It's impressive how adults reject the fault of bullying on the victim. I had to not react, to learn to ignore the bullies, as if they were some hurricane and had no control over their own actions.

Compared to this, university was a breath of fresh air. I could mostly choose to not go to class, the site was completely open to the exterior, teachers were ready to help people in need and left alone people that wanted to be left alone.

I've preferred talking to older people most of my life, so I find the idea of the author of multi-generational groups appealing. Maybe don't remove high school, but at least leave the option for people that don't work like most other people that seem to enjoy high school. Also, have zero tolerance for bullying. When the thing you learn in school is that there's no justice and you can't count on people supposed to protect you, it's a bit hard to be mentally healthy after.