I find this "wings of Luffy" is more of a hilarious, secret diss-up for Sanji anyways:
- Immediately after Robin said that, Luffy flew to Onigashima with Momo, a scared, terrified 9 yo kid, despite having his "wings"
- That same "Wing Man" lost almost every battles on the sky.
- That same "Wing Man" doesn't even get to fight a literal "Winged Man" from the Beast Pirates
I don't know if it's intentional from Oda part, but I just find it hilarious and Ironic