I'm not going to give my ex her christmas present
Why wouldn't you give her the christmas present you bought her?
She is a bitch and we broke up.
If you bought her a gift and you are no longer together, it is understandable that you wouldn't give it to her now, but there is no reason to call her names.
You don't see this from my point of view. She was a real nasty person when we were together.
Whether you like or don't like your ex's behaviour, making crude remarks about her is mean and cruel. Keep your present that you bought her, but lose the vicious attitude towards her.