"Do you truly believe you're fit for the stage?" Felix asks rhetorically, condescending at best.

Okay, no. You're not actually horrible at ballet, Felix just feels threatened by your talent. He's used to being the best, great at anything he tries. So being second-bested by someone like you? That bruises his ego.

Being in the same ballet class as you is a risk to his self-esteem. "It'd be best if you didn't perform at all," he says simply, stretching his leg out on the practice barre.