No, respect is not just relating to the interview. I also refer to when he came out after the champions league win of 07-08 (where he missed a penalty mind you), and gave an interview saying he thinks he should move on. In that same period, he said that United have treated him like a 'slave'. His ego comes before any club he has played for (Real Madrid included). Throughout his first stint, everyone knew that Ronaldo will go to Real Madrid the moment they come calling - he never stated a desire to stay at the club. United was a stepping stone for him, and the club knew its a matter of extracting the most out of him before he moves on.
I don't think Keane ever did any of that. We can keep arguing that Ronaldo did nothing wrong, but this second stint was his opportunity to become a legend. The story of him coming back, and then taking United back to trophies was something that would have made him a legend - but that didn't play out. So it is what it is, he is one of the GOATs of football who had 2 amazing seasons for us.