Punch him in the eyes.
Come on, you know they dont have dicks. Astral ones at best... very.. very small astral ones...
Dont be intimidated. Call on Satan. Or you can just smack it around.
I remember i was feeling a very negative presence in my dream so i just simply grabbed it by the legs and just smacked it against the walls and ceiling like it was a fucking tote bag. Maybe it was an enemy.