N1ggas be bitching about Sanji throwing his pride away for Robin since he's always the one that saves the Strawhats' asses all the time (saving Zoro from a cage in Fishman Island, saving half of the crew from Doflamingo, saving Luffy in WCI, saving the Strawhats in Enies Lobby, saving Usopp twice from Enel and Jabra, etc.) and people got mad because he needs help from a girl against an opponent that he can't even fight.
And plus, people already know that Robin is in Wano so if CP0 already know about it then it's not Sanji's fault for leaking the information out. And Robin already thank Sanji for following her plan. But hey, you do you.