Honestly, I don't care if the guy is a child. MC could be an ass since he's famous and rich but he's doing the effort of being nice to everyone around and still has to deal with crap like that? I'm not gonna think about the bastards perspective just because he's immature, I'm gonna look at MC's that lost his family warmth in his past life and spent years suffering instead of worrying about a spoiled bully. Anyway, if MC was naive, the one suffering would be him again, with the bully getting even more annoying with the passing years.