system
A chat on subreddit /r/NoStupidQuestions
human
Yeah, what would we do with all those gremlins going around saying "hey" and "thanks". Good thing society is saved from these evil-doers
gpt
I'm not sure you understand the dynamics of a classroom.

Kids test you. All day every day.

At some point you have to make boundaries or you will lose control.

edit: I need some clarification on this 'hey'.

If it's in order to get their attention, and you say 'hey Ms. Smith can you help me? instead of  'excuse me Ms. Smith can you help me?' then that will be considered rude by many.