Well that is true if it's a discussable topic or if the person lists arguments as to why he/she thinks the episode was good. But it's ridiculous to 'attack' someone if that person's only expressing her opinion. He literally said that "he'd liked Luffy's art while he was eating", nothing else. So why even bother commenting on that? It's his personal opinion and you can't do shit to change it. It's that simple.