Someone interfering where you feel they don't belong can mean you're feeling someone or something is interfering in real life. Consider what process is being interfered with in the dream and what it represents (a relationship, project, communication, etc.).
Also, keep in mind that the person interfering in the dream may represent a different person in real life or something more general, such as the economy, management at work, the weather, etc.
Pay special attention to why the person is trying to interfere in the dream. Your dream may be reflecting your subconscious feelings about the real-life interferer or interference.