You are intensely angry with them and haven’t been able to take the situation out of your mind. For some people this is a wakeup call that they need to reach a resolution. Not only does anger make you worse at handling the particular situation that made you angry in the first place, it also makes you just generally worse at handling situations across the board. If you want your life to get back into working order, just make sure that you can resolve things with this person that you are feuding with.
When you are angry at someone in your dreams that you do not have a feud with in your waking life then unfortunately, as strange as it may sound, it is usually still an indicator that you are angry at them for some reason. This is always a strange thing that your subconscious does. Even when you do not notice that you are angry, your subconscious picks up on subtle cues that incite you to rage, and then reminds you of them later. Therefore if you do have dreams where you are angry with someone that you wouldn’t normally be angry with, then just remember that you might need to try and talk to them about it later. After all, there was obviously some reason why you were made angry by them or your mind wouldn’t be so preoccupied with them in the dream world. Talk it over and see what you can come up with. You may be surprised.
When you are angry in your dreams but are not taking it out on anyone in particular, or when you are angry for no particular reason at someone that you do not recognize in your dream, this usually means that you are having anger issues in your waking life. Have you been overly stressed out over something recently or have you been snapping at people for no good reason. This might be a sign that you need to calm down and take a chill pill. Anger is known for being a notoriously unproductive emotion. It is hard for you to get anything done when you are angry. Another danger of this though is medical. People that are angry often for no reason have high blood pressure that goes along with this. You should see a doctor to make sure if your anger does not go away soon. You can never be too careful once you have dreams where you are unnecessarily angry. Remember all the health risks, and also remember the social risks. Don’t allow yourself to ruin your relationships with friends and family just because you can’t control your anger.