That's the problem right there. Once again, he's telling the media about a private conversation he had with a player, including quoting or paraphrasing what he claims the player said. Why is he telling the media? If I was Ronaldo, I'd surely consider this none of their business, if it even really is, verbatim, what Ronaldo said. It also pins the "younger players" against Ronaldo, when they hear it.
Rangnick just has no sense of boundaries. He's got a few more months to be pissing off every single player one by one with this kind of approach.