America's champion gymnast Simone Biles has slammed the toxic beauty culture that prevails and the trolls that never spare her for the way she looks.

In a recent Instagram post, she wrote: "Let's talk about competition. Specifically, the competition I didn't sign up for and feel like has become almost a daily challenge for me. And I do not think I'm the only one. There is growing competition that has nothing to do with performance itself. I'm talking about beauty."