This kind of nightmare is what happens, folks, when we have mandated "reporting" of BMIs and other ridiculous "measures" of thinness/fatness. Especially for children, who are still growing and who do not grow in a linear fashion.
This particular incident happened in the UK. But it could easily happen here, now that states like Arkansas and New York require it, and other states are considering it.
You say that this is an extreme case? That overall, BMI reporting is a good idea? Read these talking points from the Eating Disorders Coalition.
Our language around these issues is loaded and complex, because we have made it so. We've made fat a dirty word that connotes so many negative qualities: lazy, greedy, sloppy, messy, stupid, unattractive . . . . No wonder 11-year-old Katie Owen reacted the way she did. She's not the first, and she will not be the last.