I think the focus is on pedantic corrections that are entirely irrelevant to the discussion and serve only to make the commenter feel superior. For example, see this recent thread [1].

The first commenter proposes a device that would use a Molex connector. The second points out that the device needs to interface with a wire not found on the Molex 8981 connector, a useful correction. The third makes the inane observation that Molex the company makes many connectors, when it is obvious that the first two commenters were referring to the Molex 8981 connector specifically.

[1] https://news.ycombinator.com/item?id=5638420