Sometimes an author creates awful characters and clearly relishes that. Highsmith did that. Most crime novelists do I suppose, either as victim or criminal. Harris' Hannibal Lector is another. What's noir but sexy awful people doing one another in?
These main characters are not awful But it feels as if Thomas is filled with contempt for them. There's fat shaming and slut shaming and flyover shaming: what possible horrors can the house hold compared to these?