I can't speak for the others, but I read entire threads before engaging in a discourse. In this particular instance, the thread[0] started out as a flagrant misrepresentation of the facts, loaded with inciting terms to bait the esteemed reader into an emotional explosion. Since there was no meaningful discourse to be had, only a factual correction was appropriate. The choice to get insulted is entirely discretionary.
[0] https://news.ycombinator.com/item?id=43007980