It is unfortunate that some people just have no concept of how to be civil.
People who can't be polite or appreciative should not be allowed to comment at all. As a skinner myself, I know that it really REALLY annoys me when someone comes on and trashes my hard work.
I'm thankful that most people are glad that skinners take th time to share with the world their creative endeavors. But those who are thoughtless and rude should not have the priviledge of being able to comment at all.