There seems to be a confounding of neutrality with "realism" (what I got in the quiz) here - the later as I have seen it in this context is typically defined as the capacity to divorce ones emotions from reasoning in "positive" (the fancy term economists/philosophers use to refer to statements concerning how the world "is", as opposed to normative statements about how it "ought" to be) type observations, analysis, interactions or whatever, which I think is mostly consistent with the definition used here.
But that ability does not seem to me to be mutually exclusive with a pessimistic or optimistic everyday and general life outlook. Although, I have noticed that people who I deem "realist", that is people who are good at seeing the world as it is and not as they/we would like it to be, are more often pessimistic than optimistic. And I think that probably makes sense - the real world is a very amoral place.