Dont try to defend yourself, just validate. If thats how shes feeling then thats how she feeling. Just say I understand how you could feel that way. That alone is probably a 180 for you... I dont think that you can be right or wrong with feelings, they are reactions, shes not trying to be mean, or whatever, thats just how she feels.
By not validating how shes feeling your only going to make her more angry. You dont have to agree that it was horrible, but you do need to recognize her feelings about it.
I guess I gave the wrong finger to the wrong man...