I think it is really hard for us to separate words from their meanings and I think that, even unintentionally, we will always have some aversion to words whose meaning we dislike or find "gross". I think it would be really interesting to see a study in which the participants did not speak the target language and then judged how attractive sounding the words were. I think the results would be at least somewhat different than those studies done about English words with English speakers, who cannot fully disassociate the meaning from the word. On the other hand, maybe we give gross sounding names to gross things. Maybe our language reflects our preferences, instead of our preferences unfairly classifying our language.

Does he have any proof for this? I find it hard to believe that compulsory education INCREASES our belief in the irrational, especially as scientific study grows in depth and spread as time passes.

This guy really, really hates conventional schooling. Amplify fear and destroy passion? Is school really that much of an Orwellian dystopia? 

So we should only be taught and seek information that we are passionate about? Or we should only find the "fun" information? It's easy to make the analogy while talking about baseball, but try to apply it to some actual school subjects. If kids only do what they're passionate about, we'll have a country full of adults, some of which can't multiply and some of which don't know the significance of 1776.