I think the way any forum member, not just in 4chan, replies to topics is very simple: they find something they heavily do not agree with (ie everything), get off the computer or electronic device briefly, punch and jab a couch, pillow or mattress for 5 minutes to raise their blood pressure, then go back on and reply in the worst way possible.

Forums have become about as predictable as the average angry Gamestop customer who arrives late to pick up that special edition of the latest shooter or MMORPG he preordered.