This drama clearly makes no sense. If he is trying to force you to join his game, ignore it, this isn't really spam since it wasn't much. Also, saying I WILL DRAMA YOU will not help you in your future. So far, your rep is going to go down since you and him were acting very poor; mostly you since you wanted to backhand him with words in caps.
You should have just blocked him and then unfriend him. End of story.
Is it really that hard?