You give me serial killer victim vibes. "Have you ever danced with the devil in the pale moonlight? I ask that if all my victims before they d... Trips over a curb
"You're not the first person to tell me that." - then pause and look slightly up and to the side, smile a bit as if reliving a fond memory. Then "snap out of it" and get back to it ..
I'm gonna be real, the best comeback here would probably be self improvement, not some witty sentence leaning into looking like a serial killer or threatening their life.
They are saying that solely to hurt you. You have the option to stoop to their level or keep the high ground and keep improving yourself.
Wow, I was just thinking you give off murder victim vibes. Weird, right? You wanna hang out later?