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I guess that the difference between the above examples comes from the fact that the roles are switched - who is being rough and the victim.
First example -> the rough person initiates a fight, the second person replies as defence.
Second example -> the first person is the victim, the second one’s reply is sarcastic so he is initiating a fight again.
I would be glad to be corrected if I am wrong!
I’m agree with Stanstst, I also think that is a matter of roles. The second response seems sarcastic, because it couldn’t be a nice thing to have your essay destroyed. Or it could means that the essay is not very important to the owner. I hope I got it.
I agree with you that using that phrase if you meant your answer to be sarcastic would certainly be acceptable.
Maybe examiners don’t understand sarcasm?