I'm thinking of bullying my former high school bully out of revenge
Thats awful. Why bully a former bully?
Rude or not I'm going to do it
I can hear what you're saying but it is very wrong to bully others, even if they bullied you in the past. You should resolve your issues with conversation not violence. Otherwise you are no better than they are.
I love it when people bully me. It's fun to bully others.
It might be fun for the bully but you're just making people feel bad. Instead of trying to get revenge why not just move on and start the healing process? Spending energy on making others feel miserable can ultimately come back and bite you in the behind.