I'll try to clarify what I meant more concretely. The parent commenter in that thread seemed to think that any good person who knew the context would understand why it was bad. The next comment didn't see why it was bad, so the first person decided the next must not be a good person. Had they examined the other premise (context), they would have seen that lack of context is more likely. Of course there are other buried premises and assumptions, and all of those are more likely in some way imprecise or something rather than the next commenter simply being a bad person. Even in the most extreme cases, miscommunication happens all the damned time. Fixing those instead of deciding you're better/smarter/whatever is where I think those discussions should go.
The point is how the disagreement looked from the point of view of the person making those comments. I figured my own point of view isn't relevant to the meta-discussion.