I could buy you and sell you - A cocky way of saying you’re not even worth my time, like yo

A cocky way of saying you’re not even worth my time, like you’re a bad pizza that’s already cold and soggy.

My brother said that to me after I spilled soda on his laptop.

My teacher said that to me when I forgot my homework again.

My friend said that to me when I tried to join his group chat.