When do question tags indicate irritation?

[TBDLi]

Hello All,

About the question
Sarah: 'I've torn up your homework essay!'
Paul: 'That's nice, isn't it?'
Could the answer be 'You have, have you ?'

Thanks in advance

TBDL

[Alan]

Yes, you can say that but in that case it's matter of fact and shows no irritation. The other one That's nice .... indicates irritation and sarcasm.
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