Lol, my Career Awareness teacher makes fun of students a lot and is very sarcastic.
Because he his dreadfully unaware of his career. The irony. This will result in an unsatisfactory mark on his personnel file.
Not really, though, like I said, it isn't always. Supervisors aren't going to burst in through the doors and scream "WHATS GOING ON HEEERE." on a crusade to kill all the students who are chewing gum or something that like. But sometimes it is better to be safe no matter how mundane or silly it may seem to be.