same way question tag

Negative 'same-way' tags are occasionlly heard; they usually sound aggressive.

I see. You don't like my cooking, don't you?

Practical English Usage, by Michael Swan, Oxford University Press 2005

So he doesn't like his job, doesn't he?

Page 813, A Comprehensive Grammar of the English Language, Longman Group Limited 1985

Written by Randolf Quirk, Sidney Greenbaum, Geoffrey Leech, Jan Svartvik

Index by David Crystal

He isn't ill, isn't he?

Page 892, The Cambridge Grammar of the English Language, Cambridge University Press 2002, Rodney Huddleston and Geoffrey K. Pullum in collaboration with Bauer, Birner, Collins, Denison, Lee, Mittwoch, Nunberg, Palmer, Payne, Peterson, Stirling, Ward.

I am not surprised that many native speakers object to negative-negative question tags for I know they are considered substandard by American speakers and only some British grammarians such as Michael Swan and Rodney Huddleston have found a few instances of them being used. Not all native speakers agree about how we should say some things. Even commonly used idioms and expressions vary tremendously from one area to another. Please do not hastily conclude that negative-negative question tags are stupid. I know their limited acceptability and I myself don't use them. My original question was about the intonation of 'same-way' question tags. I thought they should be used with a falling intonation, because they are not asking for information - and not even asking for confirmation of information. They are merely making a statement (or statements). Now I know that positive-positive tags can also be used with a rising intonation and sound sarcastically suspicious.  

%He isn't ill, isn't he?

The above sentence is quoted from The Cambridge Grammar of the English Language, Cambridge University Press 2002. The symbol % indicates the status of the following example: He hadn't many friends. [grammatical in some dialect(s) only]

According to the second edition of Practical English Usage, negative-negative tag questions are only possible in British English.

Since modern British English is currently being quite strongly influenced by American English, the negative-negative question tag is probably becoming obsolete.