I know all these lectures about how the author means for us to take the events of the story are kindly meant, but they're totally irrelevant to how readers respond to the story.
There are the kind of stories where all sorts of bad behavior are depicted in a light-hearted way, and where events that would be horrifying in real life are meant to be, and are taken to be, uproariously funny.
There are stories where those exact same things are taken seriously, and where the bad behavior is shown as having real-life consequences, or sometimes even worse outcomes than in reality.
Sometimes extremely talented narrative artists (authors, playwrights, mangaka) can even successfully include both of those effects in the same work (although the only such examples I can think of offhand are highfaluting people like Shakespeare, or James Joyce in Ulysses).
This mangaka, IMO, is not one of those.