My 24 year old daughter was fat shamed at school. She wasn't particularly fat, just a bit overweight like most of our family (I'm not one of those MNetters with 6 ft beanpoles...both of my kids are under 5'7" and a tendency to be a bit on the big side).
We knew she was a bit overweight at the time and as a family we were starting to eat more healthy and be a bit more active - it helped that we had a manic puppy at the time who never seemed to tire.
She was starting to lose weight in a sensible way....
Then she had a falling out with someone at school and in that nasty teenage girl way, her old friendship group turned against her and started a period of intense bullying mostly focussed on her weight.
Her response to that was to stop eating, then binge eating and abusing laxatives and making herself sick. It took us a few weeks to notice but when we did she denied everything. We started putting in what felt like draconian and controlling measures like stopping her leaving the table, making her finish her dinner, not allowing her to be in her room alone for a while after dinner. She railed against us and went to live with her biological father....where she was allowed to do what she wanted, so spiralled quickly.
To cut a long story short, she ended up collapsing and being admitted to a secure unit after trying to kill herself because she felt she wasn't skinny enough - she was. I'm not going to post her weight and height.
It's now 8 years later and she's doing ok. I won't say she's better because we all know that her recovery is fragile and she is easily triggered by stress into the habit of skipping a meal or binge and purging. It will be a lifetime struggle for her. She has gone from being a confident, happy and active 15 year old, to a broken 18 year old having to be tube fed, to now, a 24 year old who has fought back - retook her exams and got good grades, went to University and now starting a career.
Some of the posters on those weight threads remind me of my daughter.
Others remind me of her bullies.