Maybe it's because I 'technically' work in the media that I feel this way, but I really don't think there's a predetermined negative media bias against Duke (or UK of UNC, for that matter). The fact is, Duke moves the needle. With that comes a whole lot of positive stuff, but also negative things too. It's kind of that taking the good with the bad type of deal.
I forget the name of the kid from Iowa....is it Woodbury? Anyway, he's the one who had the multiple incidents of poking someone in the eye. In the grand scheme of things what he did is probably equal (or greater) to Grayson, but who really cares about Iowa? They're an example of a team who doesn't move the needle. At all. Is that fair? No, but it's kind of taking the good with the bad again.
Please don't take this to mean that I think some of the coverage on Grayson hasn't been bad. It has been. But that's standard operating procedure when you're Duke. Someone earlier in the this thread used New England as a similar example....it's pretty much right on. Duke is the modern-day villain in college basketball. Sure, opposing fans will say it's because of people like Grayson Allen that Duke is hated. But that's not entirely true. If Duke wasn't Duke, ESPN and all the way down to the little podunk station in Cody, Wyoming wouldn't give this the time they do because, you guessed it, it wouldn't move the needle. Duke is Duke because they win, have best basketball coach of the modern era and because people love to hate the 'bad' guys. While I hate some of the negative coverage that has taken place, I'm also resolute enough to know that Duke, whether winning or losing, keeps people talking. Again, that's often times good, but it can be bad too.