The Portuguese coach has pointed out that his star player does not react to boos from the crowd, and moved to dismiss rumours of a rift between himself and the second-team coach
The 27-year-old was repeatedly called 'Barbie' by the home crowd as Madrid strolled to a 5-0 victory at Mallorca on Sunday, and the hugely-successful trainer has leapt to his defence.
"Insults aimed at Ronaldo? I don't think what I say will change anything," the 49-year-old was quoted as saying by Marca.
"It is not easy for a player to play away from home and be insulted. You can criticise some of his reactions, but I've never seen Ronaldo answer insults with bad manners."
Mourinho went on to dismiss claims that his reticence to use homegrown players had caused a rift with youth coach Alberto Toril, but stated there is a big difference between the Castilla side and the first team.
"My relationship with Toril is normal. I do my work with the first team, he works with the second team, in this case.
"I have three players that he can use when he wants, and I can when I want. I think it is positive for us both if we have good quality players, and it's good for me that players can play for the Castilla if they don't get minutes here [in the first team].
"The collaboration between us both is positive, but he has his autonomy. They have a different system to us, they have a distinct model. They have players who play in positions which do not exist here. We don't play 4-4-2.
"I respect his autonomy, just as he does mine. There is not a problem," he said.