When deleting a directory with rmdir should the permission check to see if a user does have permission do delete be based on the directory in question or the parent directory of the directory to be deleted?

For example in my home directory I have 3 subdirectories, user1, user2, and a newly created and empty foo and each directory has 750 permissions while home has 755 and is owned by root:

user1 is owned by user1
user2 is owned by user2
foo is owned by root

If I were to
As user1 if I were to try to
I would get an error message saying I do not have permission

However if I were to move foo with root to my owned directory user1 and try:
foo is removed.

I can not tell if that is an error or working as normal.

it works like this on my system, too.
i find it logical.