Dreaming that you are a sniper, has importance of suppressed aggression. To be a sniper in the dream, means that you need to acknowledge that aggression. Additionally, it means that you may need to control your anger or express anger in proper manner. Dreaming about being attacked by sniper, has the symbolic significance of anger that someone may have on you. Maybe someone has targeted you with an uncontrollable aggression. Dreaming of being attacked by sniper, suggest for you to be more polite even if the person is not able to express his or her feelings in proper manner.
Dream dictionary: Sniper dream meanings
If you are the sniper or dreaming about one, then it shows the hidden frustration and anger you have. Make sure you externalize the negative feelings and emotions, but in a way that would not hurt or insult the others.