I'm going to refuse to return an item after the seller publicly calls me out on facebook
You got a vendetta against the seller?
He was mean to me.
I'm uncertain of the fine details in regards to this sale. If you cheated him somehow and you're being greedy, just return the item.
Nah, I'm going to keep the item.
It sounds like you're in the wrong here and shouldn't refuse to return it just because you don't like the person. You could get into a lot of trouble here.