it's not about being sexist,it's about target demographic really
That excuse doesn't count anymore when a product has such a huge success and the author had such an enormous independence. Even if the vast majority of the One Piece audience is composed of insecure impotent little boys who can't handle a strong woman Oda has enough power and influence to make them take it. So no. The bad treatment of female characters in OP is entirely Oda's decision
But the eternal and unchanging sexism of Oda aside this chapter is promising. I hope that this arc is not going to be just another waste of time but will use Sanji's wedding as a spring board to really get into the fight against the Emperors. I wouldn't be surprised if Luffy somehow managed to cause an enormous conflict and outright three way war between himself, Big Mom and Kaidou with a surprise appearance from Aokiji. Because even with Gear 4 I can't see Luffy managing to take down a Emperor by himself.