Nah, I'm not going to argue that he's slagging off Mackie.
I think almost every Oxford fan sees that Mackie's race is now run, that he's no longer an effective striker at this level and doesn't deserve a place in the team except maybe when a bit of shithousery is required towards the end against a tough opponent.
I do, however, think that the argument is slagging off Karl Robinson, though.
People who are complaining about the Mackie two minute cameos, and are saying that the club would be better off giving those two minutes to someone else, are effectively accusing KR of wasting the club's money just to get his mate a payday.
Personally, I think KR knows what he's doing. I think all the evidence suggests that he knows how to build a happy and effective squad - you can see this in the performances, and you can see this in the league table.
And if KR believes that getting Mackie paid in a way that doesn't compromise the quality of performance, and in doing so that keeping one of his senior pros happy, is a good way of maintaining squad unity (which, by the way, is an absolutely classic team building tactic - identify the key leaders and influencers in a group, make sure they're happy and they'll bring the rest of the squad along for you) - then I'm perfectly ready to trust his judgement.