Not to mention, some of the arguments can be made about HN without changing a word. Reddit is different because people tend to chose subreddits that they care

Not to mention, some of the arguments can be made about HN without changing a word. Reddit is different because people tend to chose subreddits that they care about, so the discussions are generally more positive. For example, there are small subreddits about FirefoxOS or Jolla, that contain discussions about both topics, and are quite enthusiastic. On the other hand, any HN discussion about those topics is full of people who are doing nothing but complaining, putting (the thing) down and nay-saying.