I think Mourinho is quite happy to have the media against United, whether it is actually true or not, it helps create that sort of siege mentality that he likes, telling the players to go out and stuff the medias words back in their throats. He thrives on that sort of atmosphere. I think most of the negative comments are linked his style of football, as Liverpool and City are being heralded as playing the beautiful game currently.
Fergie did a bit of it in his time also. It's one way to get the players fired up.