If someone is gonna be a [bleep] to you... don't crouch down from it. Use it as inspiration.
One girl, who was called "trashy," decided to go all the way with that term. She DIY'd her prom dress... with trash bags.
Not that I recommend making your own prom dress... but taking someone's words and using it against them is the best.
Once upon a time, I didn't have a nickname that stuck. Then I discovered that a bunch of haters were using "EB" as a secret code to talk about me without me knowing.... now it's what everyone calls me because I think it's great!