I've decided that I am going to taunt the girlfriend of my dad, who passed away.
What is  your reason for taunting her.
Because of  her, he didn't want to be my dad.
It's unfortunate that you weren't close to your dad, but he has passed away and nothing can be done to change that. Taunting his girlfriend won't make you feel better.
She took everything away from me.
Your feelings about her are valid, but taunting her won't help you heal. I'd suggest getting professional help that can talk to you about your grief, both when it comes to your father's death and him not being there when he was alive. Speaking to someone is a good first step in healing.