Girl, believe me, you ghost, you bad old man. How can you reply humorously?

Girls are teasing, so you can answer whatever you want. If you don't know each other very well, then answer seriously: I'm not bad, believe me. If you are familiar with it, you can tease her: I am a bad old man, and you are as bad as a bad old woman. We are all the same. Let's trust each other.

I hope to adopt. Thank you!