The optimist believes things will get better, the pessimist believes things will remain bad, while the realist recognises reality and seeks to improve their position.
When things don't get better, the optimist collapses. And when things remain bad, the pessimist becomes depressed. And the realist in recognising reality, and working to improve their position, is resilient.
The optimist believes mbti will make their life better, and when is doesn't they leave mbti. And the pessimist believes mbti will not make any difference and so become depressed. While the realist recognises that mbti has the same truth value as astrology, and seeks to understand the history of mbti, and how mbti is used today in society, indeed how mbti fits into a narcissist society based on fantasy.
The realist is fascinated by the resistance to reality by the optimists and pessimists of Typology Central, and recognises that taking away their fantasies is like taking the comfort blanket away from Linus van Pelt, click on Linus' security blanket - Peanuts Wiki