Not a Quitter

Dear friend "S" reports a dialogue from a recent walk with her daughter "H", upon seeing chalk drawings on the sidewalk:

H: I am still mad at [somebody] from when he yelled at me for getting close to the Stop Line.
S: What? Is that even a thing? What Stop Line?
H: Yes, it's a thing. He yelled at me because I got close to the chalk line on the driveway that said STOP HERE. The line so that I would not go near the road.
Me: What?
H: Yeah, I was 6. Remember?
Me: Wow, way to hold a grudge — that was 10 years ago.
H: I'm not a quitter.

(conversation lightly edited for anonymity) - ^z - 2020-03-31