As I said above, this is not an issue between one camp and another, this is an issue that the Real Madrid fans, the Cristiano fans, and the Cristiano camp have within itself. They're the ones contradicting themselves here. They're the ones who said Messi needed the World Cup to be considered the GOAT, Barcelona and Messi fans never agreed to that. If you ask Barcelona fans in 2019 before Argentina even won a single title of their recent run, someone like @iamchuks on this platform, who was the GOAT, the answer would be Messi. He definitely has the same answer now, Messi is the GOAT camp remained the same.
You said it all mate. Ronaldo's fanbase has always shifted the narrative and when it comes back to hunting them they turn it out and claim Messi has to win another trophy to be called the GOAT. Messi has always been the GOAT for me even before he won any international trophy. They can keep debating about it but Messi has won it all and as a fine, I expect nothing more from him.