One of the may versatile uses of 又 is to emphasize negation, giving your negative sentence a little kick! It is Expressing attitude, Emphasizing.

Structure
In this structure, we emphasive what comes after the 又. Afterward, we add a negative verb or adjective. This grammar structure is often used in an accusatory context.

Examples

Wǒ yòu bù chī , nǐ suíbiàn.
我 又 不吃，你 随便。
I'm definitely not eating it, do what you want with it.