To be fair there was a time where a legitimate argument could have been made for this, they would still have been wrong but that doesn't mean there weren't good reasons to believe it. And as far as the shounen thing goes, Zoro/Ryuma was Oda's original hero before Luffy when he was writing Monsters.
However that time was completely smashed to pieces during Dressrosa (arguably Enies Lobby) and the gap has only gotten wider since then. Right now anyone who is claiming it should be met with ridicule.