A certain young man of my acquaintance went to his boss and informed him that he needed to leave work an hour early because he wasn't feeling well.
His boss said, "No problem."
The next week, the young man left early two more times.
Each time his boss said, "No problem."
The third week the young man blew off a scheduled work shift.
On the fourth week, the young man was surprised to learn he wasn't scheduled for any hours.
When asked, the boss said with a shrug of his shoulders, "You don't work here any more." There was no emotion if the boss's statement.
Telling me about it, the young man was distraught. "He said it wasn't a problem!"
I had no success explaining to him that a boss saying "No problem." when you ask to leave is his way of telling you that he doesn't find your contribution essential. And that is never a good thing.
"Real life" ain't like high school.