I'm no expert on how that phrase is used, but it seems to me to be a pejorative aimed at people who claim (or act as if) a digital copy of a piece of artwork at

I'm no expert on how that phrase is used, but it seems to me to be a pejorative aimed at people who claim (or act as if) a digital copy of a piece of artwork attached to an NFT is the same thing as the NFT, which is not the case. In other words, the people being accused of having "right-clicker mentality" are the people confused about what the NFT is, not the people making the accusations.