She collab'd twice with gigguk and seemed to put in 10x the effort she did when collabing with her senpais who made it possible to get into the vtubing gig to begin with. That rubbed a lot of people the wrong way (myself included) it's not enough to hate her though imo.
Another thing that makes people seethe is her passionate love of Moist Critical. Heaping him with praise whenever possible, talking about her type is manlets with 'godly hair' and constantly quoting some of his lines.
Just look how much fun she has covering his song here
https://www.youtube.com/watch?v=Q6ehybzS9vcShe'll NEVER adore you to that level and that's just too much for idolfags to swallow.