the post seemed to push positive thinking so much as to suggest that the negative didn't exist

Which is where people go over the edge into a state of UN-reality, in my perception.

I did a lot of reading on the whole "positive affirmations" idea, some years back... and whereas these practices can work to a degree they ultimately collide with our own "inner wisdom." Regardless of what we may tell ourselves, we have the wisdom to know when something is "positive" and "negative." Looking in the mirror and telling yourself "it's a perfect day!" when your dog just died? There's a cognitive disconnect from reality there... and it'll most likely catch up with you at some inopportune moment.