"good" or "bad", or even "rational" and "irrational". (Which of course are just disguised versions of "good" and "bad", if you're a rationalist.) I saw this, and felt a strong urge to walk to work where my laptop is and correct it.

Rational agents/things are not synonymous with good things. A paperclip maximizer is the canonical example of an agent acting rationally. As far as most people are concerned, including me, the paperclip maximizer is not acting in a good way.

Rationality can be bad when it's given to an agent with undesirable goals, but your own goals are always good to, so where your own thoughts are concerned, being 'rational' means they're good and being 'irrational' means they're bad. I think the article's statement was meant to apply only to thoughts evaluated from the inside.