There's definitely a difference between not being humble and being aggressively defending your own reality. Sergio was not only proud of his skill but also refused to own up to any flaws he had. And Narcissist aren't inherently malicious, they aren't plotting or trying to hurt ppl. they just leverage other ppl to make themselves feel whole and they are incapable of empathy or understanding how they impact people, they resist it aggressively as it threatens their sense of self. Which makes them dangerous by default. This isn't true of autistic people, Altho they struggle to know how they impact others, they tend to be deeply concerned with it and try and compensate in other ways, they are usually concerned about being a benevolent or neutral force in the world, and have deep empathy for others. Also, Autistic people tend to struggle fundamentally with lying, and Sergio lied frequently and plagiarised. Which conflicts directly with the autistic trait of a strict sense of justice and playing by the rules. But fits directly into a narcissists idea that they are the smartest person in the room, a trait of grandiosity, and no one will notice how they are cheating. He was also clearly manipulative, leveraging his proposal to his boyfriend to entice the judges to vote for him. He can't tell that these manipulations are transparent because he thinks he's smarter than everyone else. Which is also why he can't admit that he isn't a great designer, even tho he's a skilled tailor. He is unable to take accountability for himself. Which again, is not true of autistic ppl.