Was he even? He was just a big dude who was part of an army that was opposing the (genocidal af) Israelites.

I guess maybe in that, according to the story, he was cocky and challenged them to bring him their best fighters for single combat or whatever, but I dunno. I'd say rampant genocidal army, and a future king who would obsess over foreskins and send his mistress' husband to the front line to die, might be the bad guys there.

Probably worse than just thinking you're a better fighter than you actually are.