Complaining is programmed in the human mind. It doesn't matter how good we do have it, we always will be looking up and see how other people above us are doing.
If somebody asks me how I am doing, I most of the times respond with: not bad, no reason to complain but I will do it anyhow!
Thanks for commenting @fullcoverbetting :-)
Don't we all! And we all know it of each other too. Funny thing, isn't it? Must be part of our programming then indeed :-)