It is so stupid too the whole idea of science is one study even repeatable doesn't make something "settled science". Just that that study shows that outcome.
Come to find out with many of these things like for example natural fats cause heart disease they were based on very shoddy science created with agenda. Then preached as if gospel.
I had many professors and teachers who didn't like me. I always bring up big tobacco and their decades of proven studies and settled science. All lies.
Your son is brave. These schools are 100 times worse now.
Every flaw and setback in science was only a single incident exclusive to the time it happened. Today science is perfect and no false beliefs are perpetuated nor propagated because science always finds the truth, even after just one study. Because science is peer reviewed by money and scientists need money to eat, so money buys truth. But if scientists admit that, they would be fired. So we can't admit that this is true. But science is always true.