I don't understand why Fuse isn't hated. He's an asshole. I might be wrong because it's been awhile since I've been into apex. But from what I remember. After his home (Salvo) joined the syndicate he immediately joined the Apex games, completely abandoning not only his people, but Maggie too. This wouldn't be a problem if the Syndicate was actually a fair government. They came in and destroyed the Salvonian way of life and actively took supplies away from Salvo, an already poor and struggling planet. And where was Fuse? Off enjoying the glory of being an Apex Champion while Maggie fought for her home. He hides behind this facade of being this cool, down to earth guy. Calming to be a proud Salvonian. But where was he when his people needed him?
And on top of this, I hate the way he treats Mad Maggie. I'm not sure if he's still like this, but I remember when she was first added to the game he acted like she was just utterly insane. And sure, maybe from an outside stand point she can come off that way. But he knows her! He knows how much her home means to her! He knows that syndicate coming in and changing/destroying everything she knows destroys her. And it should do the same to him! Even going out of his way to call her crazy to the other legends.
Mad Maggie has every single right to hate his guts. First she finds out her home is getting sold to the Syndicate, then her best friend and partner in crime just decides he's gonna up and leave! No amount of apologizing can make up for what he did to her.