I concur with regard to critical thinking being a taught skill. My read is that parent's comment is possibly more of a vent about the type of person many of us have become more familiar with than we ever wanted to in the past decade or so of "post-truth" discourse- the virulent, intentional ignoramus. (We could write reams about what leads people to be this way, but in the interests of keeping short-form commentary short-form, I'll say that I think there are a confluence of causes :P).