Dream about someone promoted at work is a clue for your lacking sense of belonging. You are releasing all those pent up emotions and negative feelings. You may be trying to resolve your feelings of loneliness. The dream unfortunately draws attention to an argument or problem that is not valid. You do not want to take a side.
Someone promoted at work dream is unfortunately an aspect of your former self that you still have not completely let go. You are trying to be more yielding and more flexible. Your current love interests are not measuring up to your ex boyfriend/girlfriend. Your dream points to the shaping and development of your personality. You are using your power to protect yourself against the fear and anger.
If you dreamt about someone promoted at work:
This needn’t be the case if you are careful, and watch you don’t become carried away by senseless arguments. If you really do have an axe to grind, then you may consider sharing your feelings, but it would be wise not to go over the top with this.