Generally speaking, dreaming that your good friend is afraid of keeping snakes may reflect your worries and fears about certain things or interpersonal relationships. Snakes symbolize deception, betrayal, evil and danger in many cultures, so this dream may represent your distrust of some behaviors or words of your friends, or your fear of the unknown and uncertain things.
However, the meaning of dreams is very complicated, and everyone's interpretation may be different. If you are troubled by this dream, I suggest you try to record it, including your feelings, the details of the dream and the background where it happened, so as to help you better understand the meaning of this dream. If you are still confused or uneasy, you can also consider consulting a professional psychologist or therapist, who can help you better understand and deal with your emotions and dreams.