It's not acceptable to disrespect your boss.
Tom was passed over for a promotion at work when he feels like should have gotten it.
Tom wants to show his displeasure.
Tom respectfully says that he wished his boss decided differently, but he will work hard in the future for other promotions.
Tom yells at his boss, calling him a fool for not picking him.
Tom's boss is happy with Tom's honesty.
Tom's boss gets mad and fires Tom on the spot.