He has scored 57 goals in 67 games in Serie A since joining.
But, his exploits haven't been taken into account by Bruno, who thinks he should have learned Italian by now.
“He is ignorant,” the former Juventus, Fiorentina, and Hearts defender told said on TikiTaka.
“He has been in Italy for two years and has not yet learned to speak our language. He uses Spanish to express himself. He has no respect for his team-mates or for the Italians.”
His words are in contrast to those of Ronaldo's current team-mate Juan Cuadrado, who recently praised the multiple time Ballon d'Or winner for his professionalism.
“Ronaldo is very happy, he couldn't wait to come back and play,” Cuadrado said of Ronaldo's recent return from coronavirus quarantine.
“You saw that from the moment he stepped onto the pitch [against Spezia].
“He's an extra weapon for us, we all know what he gives to the team. He is very confident and that helps us too, passing on the professionalism and desire to win that we all ought to have.”
Ronaldo had missed a handful of games for Juventus after being forced to self-isolated, but made a successful return to the team at the weekend as he came off the bench to score two goals in the 4-1 win against Spezia.