The original sin lies with Oda for making Sanji's backstory so basic and cliched.
Though, like always, the anime does nothing to lessen the blow; instead they just stretch out the mediocrity to infinity and beyond.
My point, however, is that the anime is using every opportunity they can find to have Ichiji/Niji/Yonji, or a combination of whichever, or all three, beat up on Sanji.
Every week on Youtube, I'm finding new Sanji Vs Whoever videos. More instances of Sanji getting kicked. More added scenes of the brothers beating him up.
Maybe I'm just hating it because this is my least favorite part of the arc, that as well as the "Stand around and wait for something to happen" I.. I.. mean, the "Seducing Woods" part of the story.