>>2607556>where the rumor started fromFrom what I remember the rumor immediately started on pretty much every One Piece forum, Oda is someone who is known to work a lot and the fact he got married immediately spelled memes about his wife cheating on him while he was working
Things didn't get better after the timeskip where Oda seemed to have a hate boner for Sanji and Nami kept getting her boobs exposed (see Punk Hazard) so people started to joke about Sanji's VA fucking his wife henche the hate boner he had for them
At that point it was mostly jokes but people started to believe the rumors after that scene in Wano with Nami and the fact that Oda immediately released that comment interview about going with his wife in a public bath after those bath house chapters were published. People connected the dots at the end