Vulcans don't believe in fairy tales. Stories of far away mythological worlds of pretty young girls abused and victims of some travesty; suddenly to learn they were princesses all along. No hard work, no struggle to better society and contribute to it. Instead it's nothing but nonsense, giants and last unicorns trying survive.
He would listen as his mother would read to him quietly at night these tales, knowing it made her happy to. All the while thinking how illogical, pointless and harshly human she seemed through it all.
It was than Spock realized and understood what half was superior.