I think it is safe to say that Rhule is a very positive person. With that said, when people believe in you it does tend to help. The humanistic approach does seem to work, we do it with young kids all the time. It is why the ugliest picture of a school bus or an ostrich (because you can't tell) still ends up hanging on the fridge.
Frost was sort of that way too but he also did a lot of "we need better guys" bit. I have coached with Coach Positive, Coach Negative, Coach Yeller, Coach Intimidator, Coach All-Business...
I never know which is the best approach, I know I was Coach Joking...I gave a lot of praise and when I was negative it was done with sarcasm in a joking way.