I can't say that I blame any department, company etc that receives continuous complaints from an individual to ignore their complaint or label that person as a chronic complainer. Some people complain about anything, its ridiculous and they know who they are. Its one thing to cry on this board how poorly we get treated, what we didn't get, what we should get, what the book says etc but these are often things that we shouldn't be running to the Diamond desk (or similar) about.
I would agree with aflyer on the three categories that we fall in. I too try to be in the latter category. However I do make sure that when I complain that it is for a major problem, not something small and insignificant. For example, I would never complain that my chocolates were missing, my bed was not turned down, my water was missing, its just not worth it. Now when I don't have hot water, the upstairs neighbors are having a frat party reunion then I might say something. I try to write in the good as well. For example, I just sent in a HP comment card from the onboard magazine stating the excellent service from a particular flight attendant. I will do the same in a hotel if warranted.