I must admit I've said some rude things, mostly in defense of myself or others. And I have no problem confronting people about their snippiness. But from another angle, don't take everything to be rude or arguemental. In one posts I was pointing out that cats are not safe outside at any time, and someone took it to be aimed at them. My words were not aimed at anybody and by no means meant to be attacking. They were in fact very general. In another, one person was speaking from the viewpoint of the animal (cat calling a dog bad names), and was attacked for it. If I spoke for my cat I'd certainly refer to dogs as dumb animals, knowing my cat's attitude.
Basically, if you expect an arguement, you'll read other people's post with a tone of malice, and you'll find an arguement out of nothing.