You're really naughty

[assi]

Test No. incompl/elem-33 "Responses (6)", question 10

John: 'And as a special thank you for all you've done, we're treating you to a meal out.'
Sue: '.........'

(a) You're very stupid.
(b) You're really naughty.
(c) You're really horrible.
(d) You're really wicked.

Test No. incompl/elem-33 "Responses (6)", answer 10

John: 'And as a special thank you for all you've done, we're treating you to a meal out.'
Sue: 'You're really naughty.'

Correct answer: (b) You're really naughty.

Your answer was: incorrect
John: 'And as a special thank you for all you've done, we're treating you to a meal out.'
Sue: 'You're really wicked.'
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what does this ''naughty'' here mean?

[Alan]

The sense of this remark means: You shouldn't have done that and in a way you have been very bad because it wasn't really necessary but at the same time I do appreciate what you have done. In other words the word naughty is used here in a very ironic sense.
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English as a Second Language
You can read my ESL story Cool Expressions