I must remember never to ask BobK a potentially contentious question like that!
As a general rule, questions which start "Do you" or "Don't you" attract either "Yes, I do" or "No, I don't" in one form or another as part of the response. There can be ambiguity if you don't clarify with "I do" or "I don't" though.
- Don't you want pizza for dinner?
- Yes.
Does the response mean "Actually, yes, I do want pizza for dinner" or does it mean "Yes, you're right, I don't want pizza for dinner"?
Is it more likely to be interpreted as "Yes, I want pizza", just as the answer to those tag questions: "You don't want pizza, do you?" "Yes" means "Yes I do want it" while "No" means "No I don't want it"
I find "Don't you want pizza for dinner?" an odd question, unless there is some earlier discussion behind it.
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