Before I quit Reddit (when Bacon Reader died) I had already curtailed my commenting because of this. It seemed that any time I tried to make a thoughtful comment on a even slightly contentions subject I ended up in a pointless argument with someone who had poor reading comprehension. It was disheartening to realize that while I was agonizing over every word I put into my comment in an attempt to clearly explain my thought, the same courtesy would not be extended by the people mis-reading it. I started to think people were just scanning comments for keywords to get angry about then telling me that I was ignorant of a subject I knew a great deal about or a reactionary child when I am 50 IRL. Commenting became a burden and it lead to a decline in the quality of conversation as more and more thoughtful commenters found that burden too great.