That they're equals by design is obvious to anyone that doesn't make Zoro's superiority a part of their worldview.
The equals narrative benefits Zoro more than it has ever benefitted Sanji.
Sanji has always had superior portrayal against opponents of equal, greater and comparable calibre and status. His signature wins are especially more dominant despite having some kind of nerf in all of them.
Thriller Bark has basically been erased from Zorotard's memories for obvious reasons.
Moriah put Zoro's shadow in the body of a legendary samurai and Sanji's shadow in a weak body?
They can't afford to stop and question how and why Sanji's shadow was equal to Zoro's despite his being in a weak body and Zoro's in that of legendary samurai.
90% of the talking points around Sanji are agenda driven and complete nonsense. He's less the popular character and Zoro stans inherently appeals to more to insecure losers that project onto fiction, who feel the need to constantly lie about Sanji. Those lies can stick in people's subconscious, but they can't change what's on the page.