If you are full of optimism and sunny happy feelings then it is not living in reality, or at least not seeing the full reality around you.
If you are full of pessimism and always grim and somber then you too are not living in reality, or at least not seeing the full reality around you.
The truth of reality is that it can be great…. for long periods of time. Even for a whole individual lifetime for some, but it is bleak and miserable for very many others. It is difficult to understand how some people can be perfectly content with the world when it is full of poverty, violence, greed and villany. People should be able to recognize that these conditions exist which would naturally temper the optimistic view of humanity. Love, happiness, humor and tasty treats also exist so one should never be too grim about the world in general.
Basically pessimists have either got hurt or been in the muck too many times to have a happy (and objective) outlook…. while optimists are just not paying close enough attention to the world in general to see its ugly side.

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