Saying you like GOT over LOTR is basically a self report that you would rather mock heroic virtue, self sacrifice, loyalty and bravery than dare to aspire to them, because you know you could never reach them. It's nothing but envy, bitterness and bleak nihilism cloaked in smug postmodern intellectualism, desperately trying to position yourself above the very things you can never hope to achieve.
Saying you like The Lord of the Rings over Game of Thrones or any other morally gray universe is basically a self report that you see the world in simple black-and-white terms rather than trying to grasp its complexity. It’s more about intellect than it is about taste.