Why the hell is this shit still serialized?
Why not? It's one of the few Jump series where the MC is supposed to be a genuine asshole and all he does all day is try to fuck over others. He's so unlike your typical Shonen MC that it's great to see him in Jump.
Because no one can stop him.
What's your point?
Is it less interesting because of mannerism?
I really liked the anime
Because it's a good manga?