Constructive criticism never will [be seen like that]. Whining & moaning is saying "you did X craply, do it better". Constructive criticism is saying "Thanks for doing X, however I think it could have been done better if Y & Z were done. What do you think?"

There's lots of evidence of the former, and it drowns out the very small percentage of the latter.

sjgadsby's hit the nail on the head in terms of our community's workflow.