Uhm... but there is.
And I'm not interpreting much at all. I'm pointing out the scenes.
There is reason as to why the animator went out of his way to animate him smashing his fist against the wall to shut up his parents.
He could've shown us the same scene with him just ignoring his parents pleading for reason. You do realize that the impact of the scene is completely different, right?
edit: The same could be said about the funeral scene.
He wasn't "disconnected" or apathetic, he was enjoying himself watching porn while his whole family had a rough time and he doesn't care. Yet at same time, he lives in the house of his parents as a 34 year old but never did *anything* in his adult live to make up for it. He's certainly not paying them any money? Or helping them do stuff?
If that isn't shitty behaviour, what is? If his parents are so "bad" why doesn't he go somewhere else? He's an adult.
The "Ifs and buts" part is about you guys assuming stuff that wasn't shown and me saying that we might as well assume stuff in favor and not just stuff against a certain viewpoint.