Remember when Rocinante explained that the family of the D was considered the natural enemis of the Gods ? ( = 神の天敵 Kami no Tenteki)
Well back in chapter 279, Luffy, a member of the family of D, was Eneru’s ( so God himself) natural enemy since he was immune to his devil fruit’s power
Garp: How do you even know he’s in a bad mood? I mean it’s impossible to read that guy.
Flashback Sengoku: This is the most incompetent, worthless report I have ever read in my life! Get your act together or so help me God, you won’t live to see retirement!
Garp: It’s like, what’s that guy thinking? You know?