I enjoyed a good laugh when I came to this part. I totally agree with Dr. Johnson that if one wants to learn something, they should begin with the foundation. In college philosophy classes, I think students ought to be given a list of fundamental philosophies and taught efficiently and rationally so that they can generate a more proper judgement and have more liberal mindsets.

In another example, it's like teaching public anxiety students on how to improve public communication by give them texts and books on those subjects.

They are those who accept their convictions and re-examine or re-evaluate and then even internalize the result that both sides agreed on. This reminds me of Sheldon Cooper in The Bigbang Theory that he always always withold his opinions to be true or superior than others'. And I think we shouldn't spend our energy and time on them who in the end see themselves as the naval of the universe.

Is this a normative statement ?

In order to make them unambiguous, what in specific is that qualitiative distinction? And what criteria do philosophers base on to produce that distinction?