I think the idea is ........ if you walked into a room full of strangers and the first words out of your mouth were negative toward the room full of strangers, how do you suppose the room full of strangers would accept you.

It doesn't take that much effort to make a point in a respectful way. If someone pops their cork and gets all bent out of shape, I tend to dismiss their comments from that point on. Some people just like to argue for the sake of arguing. They wouldn't admit the sky is blue on a clear day in the country. Why waste my time at that point.
Just treat people the way you would like them to treat you and you'll be surprised how pleasant they become. It's human nature.
Before you hit the send button, read your post as though it was being directed back at you.
If it looks fine I bet you won't get any negative feedback.........unless of course somebody out there has an "Attitude".