I'm local to DC, but not a Skins fan. And I feel for RG3. I don't think he has performed well over all, and I don't know if he can. He has also said some things that didn't help his cause.
But damn, folks do seem to hate the guy. People say he is mentally soft, physically soft, dumb, lacks leadership, too arrogant, too much of a diva, etc. Is he arrogant? Sure he is, but no worse than the next QB really. He is certainly not dumb in a real-world way - he does seem to repeat mistakes, but he's a bright guy. He's gotten beaten up badly and I'm not surprised he's a little gunshy at this point. People think his confidence is squashed, but every time he suggests he can turn it around, he gets napalmed. These latest quotes about being the best were not well-thought out in terms of their expected reception or the way it was phrased, but they are EXACTLY what you WANT your QB to be thinking. I know I can play. I know I can be great. We can do this - just need to put the pieces together. There were better ways to answer those questions no doubt, but if some other mediocre QB says them, the headlines aren't as bad as they were for RG3.
I don't think he's loafing. He's not really making poor choices off the field. He seems to be a responsible guy for the most part - just trying to do his thing. If 2012 hadn't happened, I don't think folks would be as vicious as they are right now - he's a victim of his own early success to some degree. After the rookie season, he was put on such a pedestal that he had a very long fall afterward. Such a fall that some seemed to take it personally.