Defensor was an Argentine superhero who never existed before the Contest of Champions. The writers had their choice of literally any amazing superhero in the cosmos, and they went with a strange man whose power is owning a shield. This analogy is going to sound impossible, but that's like making a movie about the origins of Darth Vader and Obi-Wan Kenobi and deciding it needs a floppy-eared moon f**k in black face. If you're going to throw an all-new character into the middle of these beloved icons, he needs to do something impressive right away. Here was literally the first thing we ever saw Defensor do or say:
His origin story was revealed later to be this gripping tale: Gabriel Carlos Dantes Sepulveda was an Argentine construction worker who found a magic shield at work. Maybe it was simple laziness, or maybe they thought that since South America liked soccer, they'd also like a superhero who sucked. Either way, I wouldn't go so far to say South America was being insulted. That came later in the same comic, when Defensor forgot which country he was from.
Oh, you're from Brazil? That explains why you keep blurting things in Spanish!