Snuffy, if you see a personal attack, let me know. So far folks have been pretty good about that. For example, CB said "I think you would have achieved deeper colors and less reflections with a polarizer." That comment is specific to the photo rather than to the photographer.
He could have said something like "You should know you need a polarizer for landscapes. You call yourself a photographer?" but he didn't. By staying specific to an image, and keeping the comments about the photo, you avoid most of the problems.
As I mentioned, critiques are tough, but keep in mind that criticism of a photo you took does not equate to a critique of you.
Let's imagine I went out tonight and tried to play basketball. (Whoever wrote "White men can't jump!" pretty much had me in mind...) The critique of my performance, or lack thereof, would be pretty harsh. Does that make me a bad person? No, it only means I'm not good at basketball. With practice that could change.
Photography is no different. While some folks pick it up faster than others, everyone has to work at it.