I think its the general idea that Sanji and Zoro were idealized as the right and left hand of Luffy for decades now. In battle, of course. Folks always saw it reflected in their bounties. Now, that idea is kinda under threat in the minds of the diehard fans with Sanji being behind Jinbe.
Personally, I see no issue. It is weird to see, I give it that but its not as big as its made out to be, I think.