The side character is a glitch

What happens when a random side character becomes aware of the world of novel and the existence of the Author and The Readers? Utter chaos. The author can't control him. The author is stressed due to the approaching deadline and this side character keeps on bitching in a novel which is his first work.

(Hey Author, are you appealing to some toddlers? Or your audience is just Grannies? Why the lame synopsis? Tell them that the MC is badass, handsome, cold, smart, tall and other things and these readers will come running in. I don't care about the readers just attract some hotties cause papa need to step into adulthood)

For the love of God shut up or I will write a meteor arc just to kill you!