"Propaganda" or not, it's still true: success in school, work, hobbies, etc. doesn't require having a romantic partner.

I think Mr. Peterson doesn't know the history of Frozen, and that Elsa was going to be the villain right up to the point they wrote "Let it Go" and decided that anything that uplifting shouldn't come from the villain. They then took a different aft direction and made Hans the villain.

Also anything Disney creates isn't, by that definition, propaganda because its purpose is to make money. There is little ideological consistency between Disney films other than uncontested points like "murder is bad". If Disney started to take a loss in movie-making to sell a message I'd buy it, but when they pull in billions off of Frozen I don't think it can be said it was primarily political.