I'm going to unplug my sisters PlayStation because of her constant insults.
How does it make you feel to mess with your sister like that?
I feel good because I'm standing up for myself.
I'm sorry that your sibling is being abusive to you, but that doesn't mean you should retaliate. Fighting fire with fire is always a bad idea, and worse fights might come after. You need to just ignore her or tell mom instead.
If she's mean to me then I can be mean to her.
Instead of retaliating by being mean show your sister an example of good and mature behavior.