You're responding to a pretty weak interpretation of what we're talking about here. :) The point is to address the strongest plausible interpretation of what another is saying. It's pretty well-established what the Principle of Charity means [1]. (By the way, you can see from [2] that there's an ongoing discussion about formalizing it for HN.)

I don't think it's a stretch, mutatis mutandis, to take even a comment like "go fuck yourself" charitably. It could, indeed probably mostly does, mean "I'm angry about something unrelated."

1. http://en.wikipedia.org/wiki/Principle_of_charity

2. https://hn.algolia.com/?query=author:dang%20principle%20of%2...