I agree with the person above - the correct answer is He is all pine and I am apple orchard.
This line clearly shows how different these two men are - pines and apples are obviously quite different. On one hand, there is this neighbor who wants to build a wall between him and the world, and on the other, there is our narrator who wants to tear the wall down.
Answer: The statement means that his mission in life is to create relationships with people and experience the world.
Explanation: