It would take something monumental for me to boo a United player. Wishing to take on a new challenge elsewhere isn't one of them. If he wants to leave, he wants to leave. As good as Rooney is, I'd be more gutted if Welbeck wanted to leave for a rival, considering he's a United boy. Rooney isn't. He's here because of the money, and I'd be surprised if anyone thought otherwise. If Rooney started coming out with the stuff Lewandowski is currently spouting, about feeling "cheated" because he has to remain at a club he is contracted to be at, then I'd probably change my mind on Rooney, but as it stands, I think he's done well to just stay silent on the matter and continue training.
I still want him to stay and just get on with it. We've lost alot this summer. A veteran, some staff, and the best manager of all time. Losing a top player as well would be difficult I think. If we can keep the current squad together with a midfield addition or 2, I think we'll be in excellent shape.