Well, for one you're on a United forum and there's still a lot of Ronaldo worship on here. Those two players have been inextricably linked through the years and you HAVE to pick one (those are the rules) so typically the other gets shit on. Not all the time, but you know.
Secondly, he's on an asinine amount of money so I suppose any sympathy is in short supply. Some are partly blaming him for Barca being in the predicament they're in now because of those wages (which is absurd, IMO). Barca are to blame for the state Barca are in.
And then, yeah, going to PSG probably doesn't help. I mean, it's not exactly a fairytale story that people can get behind, is it?