Why not just say I don't want to flip burgers at [insert preferred burger chain here] for the rest of my working life?
From a critical standpoint it did come off a bit arrogant. I'd tone down the attitude a bit whilst remaining true to your convictions.
You are dead right when you say not all your teachers will understand or take the humour as it may be intended. There are times when a little deference can help you go a long way without compromising your integrity.