I only tell strangers to ‘have a good day’,
because I do not care about them, personally.
If I care about you, I will never tell you to ‘have a good day’,
because all good is all bad.
I want your day to go according to your actions.
If you’ve made a mistake, I want you to have a bad day.
If you’ve made great decisions, I want you to have the best time.
Therefore, friends, I will say,
“Have a proper day.”