The subject could be anything, it just happens to be hack on this site. Regardless what the subject is, they'll never acknowledge/understand any other perspective that's different from theirs. It's a trait when you're immature/short-sighted. They're confident that they're in the right, you can't make a change in their view. The thing here for me is, that I love NL, and it wouldn't be so fun if I was the only human in there.
Hope this explains. Does it?