I'm going to make fun of someone who used to bully me in high school.
Why would you do something that cruel?
I want to get revenge.
I understand feeling frustrated and angry at them, but you shouldn't make fun of them. It will just make you look immature.
There won't be anyone else around. It will just be the two of us.
Even if it's just the two of you, you shouldn't make fun of them. It was back in high school that they did this, and they may have changed and regret how they treated you. It's good to be able to let things go and forgive people rather than seeking revenge.