Harry Brighouse, a professor of education and philosophy at the University of Wisconsin at Madison, contrasts the American system of unsupervised lunch periods with his secondary school in the U.K. He says it is up to adults to make schools more humane.
My first secondary school (public, U.K.) wasn’t particularly well led, to be honest. But, we had a 90-minute lunch break. Lunch was two sittings, with assigned seating. Each table had 8 places, most had one teacher, and all had a mix of boys of girls, and a mix of years (we were 12-18 year olds, and about half the kids left school at 16, so it skewed a little bit younger). The idea that you would leave vulnerable children to be rejected by their peers (or allow them to reject their peers) at lunch time was never considered.
What you describe—adults leaving children to bully, reject, ignore each other, IS already an adult intervention. Nobody goes to school unless adults make them, and nobody would choose to be at the school with the people who bully, reject and ignore them, if they had the choice. It’s up to adults to make that experience humane, or inhumane. In most American schools they choose to make it inhumane.
Echoing Harry’s positive description of lunchroom behavior in the U.K., another educator said that teachers and students eat together in France: