Comment by zamadatix

I don't think I've met many pairs of people I could ask "on a scale of 1 to 10, how biased/loaded do you think ${example} is" and get told the same exact number by both for the majority of the examples given.

Now apply that to the n people reading a given post or comment! If those commenters try to communicate on what they think is "fair game" for the given conversation, then two comments deep in and you might already be at a 7 when the author thought they were at a 3. In more extreme cases, two people could misunderstand each other through text and simply go from a 1 to a 7 in a single comment, spending the rest of the time shooting back loaded replies at each other instead of thinking about the topic together.

It's a very human reaction we all tend towards, even when we set out our intents to do the "always reply with..." mindset instead of a tit-for-tat one. That's why I always start with the ideal approach - I can count on myself to help foul it up :D.