Why Respond?

Ok what really confuses me is when u r talking to someone and they r obsessing about something and try to tell them just to forget about, they r like "would u stop ok? I get it just stop it" so then u stop texting em and the next day they respond hey. Its like y should I respond if u just told me stop texting u yesterday? It's like they forget about it but u just don't want to talk to them and then they get all mad cuz u don't talk to them but seriously ppl thts what u deserve if u gonna do that alll the time. Comment if that has ever happened to u.