Basically, I have this really annoying little fucker in my life who everytime he spots me interacting with people, says this. I’ve interacted with him very few times, so he basically doesn’t even know me.
While I am a little introverted, no one likes this bs.
Just say “ha good one” and keep talking to the other person.
Or “is that the only line you’ve got ?”
Something along those lines. Deliver it confidently , shut him down and go back to your conversation as if hes not there.