As far as I can tell, the only reason you guys hate him is because you find him annoying and boring. There’s no other reason I have seen
They are plenty of reasons, be it "He's bland and his voice grating" or "He's just gay and doesn't have anything interesting" or even "he keep ruining collabs".
Personally, Uki is just rather... plain.
Yes he's gay, yes he can sing and do originals, but he doesn't offer much more to entice others beyond fujoshis. Fulgur at least can entice followers whose there because he can do edgy characters stuff due to him having interest at writing that sort of thing (his Legatus505 stuff), but Uki's just... there. He could work with Fulgur just fine but at the of the day, its just pretty much them playing with their shippings and that doesn't really help elevate Uki's much.
Contrasting with Sonny whose personality is at least enticing when he's streaming games and also he's just that blasè with everything for shits and giggles (announcing his birthday with just "its my birthday" is one example), or Alban who at the very least is able to showcase his best hidden depth (his fast learning skills) in order to expands his character beyond "am thief who hides as convenience store clerk" and to also aid him with collabs alongside non-EN folks.
Uki doesn't offer anything to the table that is interesting enough, and thats one reasons to just dislike him aside of the ones people has espoused.
Do I hate him? Yes. Because I live in the country who are legally does not support what he is as openly as he is.
what’s wrong with Mysta? He’s just a silly boy, a goof, stupid but in an endearing way.
Also he fucked up rice and his bad cooking skill will forever be his "never going to live that down" moment despite the fact that he's done better.
Aside of that, he's fine.