Sounds pretty normal behaviour for a cat of any type. My two are not too bad, the female gets all excited if I speak to her and her brother just stares at me and walks off.
They will be affectionate but only when they want something.
My two were feral born kittens but 'saved' when very young. They are in indoor cats, but even so there is sometimes hours go by without me seeing them.
Dogs are always trying to please their owners and crave attention, it is the way of the wolf, but cats don't really care.
Anyway in human years he is a teenager. Many human teenage males ignore their parents.
Enjoy your cat, he stays with you because he wants to. He knows that you will care for him and love him.