Short attention spans, lackluster reading comprehension, and ego are three of the main culprits to this. If it makes you feel any better it's prevalent in the vast majority of online forums.
- Many people get all the information they "need" from a single sentence or headline.
- When folks do take the time to actually read the entire post, they often times don't fully understand the post as a whole. This results in picking and choosing phrases and sentences from the post that bring forth the most emotion to them.
- People who continuously argue with experts typically lack the ability to accept they don't know everything and/or they could have bad information. This prevents them from shutting the hell up and just listening.
I'm sure I've done it to some extent at some point, particularly back when I used to drink on the regs. But I quit drinking and now I try to always remember the line, "You learn a lot more by listening than you do by talking."