No. You're reducing him to being a bully. But Nuno was more than that. He wasn't an antagonist in a story with nothing more to him than his role. He was a human, a teen, he had a family, he went to school, he had hobbies, and all that was lost when he was killed. Being a bully doesn't invalidate all this.
Almost every asshole in history has had at least some people that have liked them. It doesn't mean they weren't assholes. Most assholes don't deserve to die, but literally millions of people on this earth die every year that deserve more sympathy than this guy.
Yes, he was a bully. But bullying doesn't deserve the death penalty, thus he also didn't deserve being killed in self-defense.
He was at fault, but that fault stood in no relation to the severity of the consequences.
To quote the lawyer: a tragedy all the way around.
Nobody is saying we should celebrate his death, or that it isn't in some small way, tragic, but there's only so much sympathy to go around. He beat the shit out of this kid regularly, and was about to engage in a 3-on-1 beatdown for who knows how long. And even after his victim pulled out the knife, he
continued to escalate the fight. As horrible as the consequences were, at every step, he was the one who chose to escalate the situation that led to his own death. He could have stopped at any point along the way.
I don't think the victim made the right choice with the knife, but he was left few options. Stabbing someone isn't acceptable, but neither is getting the shit beat out of you on a regular basis.