1. People don't RTFA and just start commenting thinking they know what the article is about. 2. Many strong minded people that firmly believe they are right an

1. People don't RTFA and just start commenting thinking they know what the article is about. 2. Many strong minded people that firmly believe they are right and others are wrong on so many topics. See vi vs. emacs. 3. It's common on reddit to get a lot of points for simply quoting the relevant bits of an article because there are a lot of people that do #1 from above. 4. Tangents on sites like reddit do exist and often devolve into insider jokes and memes. I've been brought to tears laughing so hard at some stuff on there.