Sure, they've adopted the Protestant doctrine of interpreting Scripture for themselves and become Protestants in all but name.
While 'Cafeteria Catholics' is what such folks are usually called they're just more non-Catholics who claim to be Christian. Just like the majority of those who claim to be Christian, they follow in the footsteps of Eve by interpreting His Word to suit themselves and in reality worship only their own, Most High and Holy Self.
So, if I say I’m a catholic but don’t believe in catholic doctrine, I can be catholic too?