Well Shay none of the JJK villains act "ragh." Not even Jogo, and he's the hot-head of the group. Jujutsu Kaisen Villains are either intelligent, sadistic, or cocky but even though their powerful Beasts none of them act like idiotic overly-agressive savages so it wouldn't have made sense for them act like that. Anyways I understand that you're someone that goes for the vibe, or themes rather than bars so I understand why you wouldn't like it as much as you were expecting too but you're rightfully in the minority and the rap had ton of amazing bars.
What do you mean "like villains should do?" Have you not seen Jujutsu Kaisen not even Jogo the biggest hot head in the series acts like some aggressive idiot.