Housemate wants to share the same shoe rack as me

I have this korean housemate in my household. I moved in before he did and occupied the top shoe rack in the common area. The shoe rack is enough to place 3 shoes on each level but I've only placed two. I have a third shoe in my room but since I'm not using at that moment so I kept it in my shoe box. Then after tenant2 moved in, he placed his 3 shoes on rack2 and his 4th shoes between my 2 shoes. I let it slide since I'm not using the space at that moment. So recently I needed to use my 3rd shoe for work and I move his shoe to rack5 occupied by tenant5 since he is occupying 2 racks, and it is the only rack with a space left. Tenant2 is not happy and confronted me regarding moving his shoe. He said for 6 months he has been placing his shoe on the rack with no complains. I said everyone in the house is occupying 1 rack and I am the only one who has to share a rack. He said this space on my rack was empty and he occupied it rightfully. I said how you like it if I saw a space on your rack and occupy it. Surprisingly he said sure. I continued and said having all your shoes in 1 rack is how it should be and how he like it if he have his shoes on different levels of rack. In the end he moved in reluctantly citing if this is what I want so be it. I swear I need a brick next time to reserve a spot.