The author sounds like an apologete of "Four temperaments" theory. He believes cynic == someone who believes in "no change" and complains a lot. Then he labels people as either "cynics" or not. It is as simple as that. (BTW, that is not the definition of a cynic at all)

Human personalities are extremely complicated, and the best you can do is correlate traits given a huge amount of data which he probably does not have. So we have him boasting a theory, that is likely based on the fundamental attribution errors in his experiences, and people, who vote his post up, who happen to have a similar sentiment with a few anecdata (who would also probably disregard any anti-anecdata in this thread).

So is the nature of most Internet posts about psychology.