Maybe instead of Snow White, you should read him superhero stories. He sounds like he needs more action and less "whistling while he works", to me. Or try The Lion King if you want to stick with Disney. But Snow White is a fairly princess-y story. Same with Cinderella---I never read that to my son when he was little. We watched the movies at one point, but he preferred Tarzan or The Rescuers Down Under. Movies/stories where the main characters are boys.
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Ziggy, I don't think there's anything wrong with it, either. But he seems to not be much into the princess side of things. He likes the bad guy--maybe not as much because she is bad, but because she DOES stuff. There is a lot more action (seems to me anyway) in the less princess-y movies. We all love watching the fairies bake a cake with their magic and then clean up... but sometimes boys just want some ACTION, and baking doesn't really hit it out of the park in that regard.
Tarzan--they swing from vines and grunt, and all kinds of manly, aggressive, ACTION.
Lion King--there's singing and such, but also some real serious violent stuff... hyenas are pretty heinous, and then there's the evil Scar and his antics.. It's still a love story in the end. And even bigger than just romantic love, but love for family, and history, etc.
I bet he'd LOVE The Iron Giant. It's a giantic robot from space that eats metal. And he befriends a boy named Hogarth. (Just saw it listed as one of the top 50 movies all kids should see before they turn 13.---we've owned it for years and both my kids--one girl, one boy--love it still).
Even the Rescuers Down Under--which has mice (and Eva or Zsa Zsa Gabor as the female mouse) for some of the main characters, has a little boy who undertakes to rescue a golden eagle from a poacher in the outback of Australia.
These kinds of movies are what boys tend to adore. They like to imagine they are the hero, or whoever is misunderstood, or doing the action. It is harder for them to imagine themselves as the hapless princess. That's all I was trying to say. Even in Sleeping Beauty (with the fabulously evil Maleficent who turns into a dragon), the only real action is when the prince/hero fights the dragon near the end. He makes a pretty brief appearance. Most of the movie just isn't that action oriented. It's birds flying and singing and stuff. GREAT stuff... but not ACTION the way boys tend to enjoy it.