You've missed the point entirely. That comment was about the nature of the content posted. Facebook, snapchat, et al are essentially click-click-clicking through pages heavy on visual stimulation and interacting through short bursts of text, now video and images too. HN is about reading and formulating arguments and exchanging walls of text in an environment completely free of visual distraction.

The type of person who tends towards HN will be different from the type of person who tends towards something like Snapchat on the above grounds.