I can believe it too, we had the fat girl bullies in my school as well xI'm often loathe to believe the Reddit posts but I do think this is true. She probably did bully people and was racist to deflect so the popular kids didn't bully her. She's already said she was a dickhead in school, always getting sent out etc. Wouldn't surprise me if she was still racist - a massively obese, ugly leopard doesn't change it's spots.
I was bullied by fat girls in school, so they wouldn't get bullied by the main bullies. The fat girls bullied me worse than the popular kids, picking on the fact I wore glasses and was poor so they wouldn't get mooed at in the corridors.