problem is this 

I, too can see that it could have been an honest mistake.  However, him attacking me shows he has no AGF.  He even denies making the edit.

The correct response would be for him to give an excuse of an error (whether or not it is an honest excuse).

Attacking me is not the solution.  Having administrators attack me shows they are not fair.  They should have tried to mediate a solution which might be "it's possible that this was an honest mistake.  whether or not is was, the user did make the edit despite his denials.  at this point, we'll do nothing.  please, everyone be careful when editing"

Instead, people attack me when I was the one who discovered the wrong information.