Bad attitude, say, during Christmas scene (10)

I believe the answer is:

negativity

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'bad attitude' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'say during christmas scene' is the wordplay.
'say' becomes 'eg' (both can mean for example).
'during' is an insertion indicator.
'christmas scene' becomes 'nativity' (I've seen this in another clue).
'eg' inserted inside 'nativity' is 'NEGATIVITY'.

Can you help me to learn more?

(Another definition for negativity that I've seen is " Expression of pessimism".)

I've seen this clue in The Times.

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