She's mad that someone, anyone, was successful at her hobby and she isn't. The fact that other cosplayers went to the largest anime con in the US, performed a skit in their Kingdom Hearts costumes for a live audience in 2005, and the video that was recorded and uploaded of the skit received 90k views since 2006, pisses her off.
Nevermind what effort it might have taken for those people to
get to perform in the AX 2005 masquerade and all those people to later watch them on YouTube, but none of them are Sarah Guilbeaux, who currently lives in her bug infested, paint tube and sex toy cluttered, vaginosis smelling bedroom in her dying parents' house with zero friends, no job and a botched heel spur, because life is so unfair. She probably thinks it's because she was forced to be a girl and wear bikini fanservice cosplays in the 2000s, that kept her from going to California and being the (manly) cosplay star she was meant to be 20 years ago.