It's the way he treats people. Not in public generally necessarily, he keeps a good facade up afaik. But word gets around behind the scenes.
Back stage workers at venues, local security (which is how I ended up hearing about it, working with guys that were contracted by a specific venue he performed at multiple times), hotel staff, that kind of thing.
We're not talking about diddy level assholery, let me be clear about that. If he's ever pulled that kind of thing, it's news to me.
But insulting and harassing staff, going out of his way to cause extra problems for people, making unexpected and absurd demands, insisting on last minute changes to lineups at festivals, just generally being a smug, condescending dick with zero cause, that he does.
Now, I never worked anywhere he performed at, but the stories came from multiple people that didn't know each other. Often enough that it stood out.
One time when I was part of a crowd at a local multi-act street concert, he delayed his show so long that one act had to leave to make their next show, and another got cut off in the middle of her set because of local ordinances about lights and sound. The delay didn't get explained to the crowd beyond "unexpected technical difficulties". But later on, talking to people behind the scenes, it was prima donna bullshit. Arguing about not being the closer (despite not having been on the slate in that slot when he agreed to perform), arguing about wanting to wait two hours so that his lightning was better, but not wanting anyone to go on before him because his gear was already set up
Just throwing a little hissy fit about everything until he ended up screwing over the crowd, leaving us with nothing for hours, and missing two acts (one entirely, the other partly) in the middle of a hot southern summer.
So, a lot of the crowd just left. Which meant the concession workers lost money, and it screwed up traffic in and out because the flow wasn't timed as expected.
Then, when his punk ass did get on stage, he only did three songs, when he was supposed to be doing a half hour of music. The extra time was just him hyping his next shows.
It's very subjective. But in my case, Fagner comes to mind. Other than "Romance no Deserto" (something like "Desert's Romance" or "Desert's Tale"), I have yet to find a second song of his that I like.
Those who once stepped outside their genre I don't like into a genre I do like. (K.D. Lang - Constant Craving)
Those who covered a good song by someone else. (Eric Clapton - Cocaine by J.J. Cale)
Those who were written a song for by an artist I like. (Tina Turner - Private Dancer by Mark Knopfler)
Surely there are some that accidentally made one good song, or used up all their creativity making it, or it was about a unique life experience that channeled itself into the song. (maybe Gerry Rafferty - Baker Street)
I don't like anything by Everything But the Girl except Missing, which I love.
I don't think Dirty Vegas has anything worth listening to except for Days Go By, which is a great song.
This one is probably pretty controversial, but I don't really like anything by Adele, except for Rolling in the Deep, which I think is an amazing song.