why do you reply?

You are doing exactly what they want. There are all kinds of people in this website. Some of them are just looking for fights. My experience: ignore them - you don't have that much time to fight! Do you really think they read every of your post? What they want is just to make you mad. If you don't response, eventually they will go away -- there is no fun when they are the only one in the stage!
By the way, lots of reasonable people don't read this kind of post.