system
A chat on subreddit /r/me_irl
human
That’s borderline worse. Like if “hi” didn’t work and you actually want to talk with person, say something else. Just “hi” is not a way to start a conversation.
gpt
It could also be two really close friends and the one saying "Hi" is acting like a bellend because they feel comfortable and are just fooling around. There's no way to know really.