Going against the grain here, but, why so sensitive? A simple suggestion is not an insult, a sign of unthankfulness, or in itself denigrating the author's efforts.

I got the same vibe from the article TBH, a lot of what he considers rude just seems like well intentioned, if possibly misunderstood, suggestions.

Consider that even filing a bug report is an effort 95% of users would never make. So even doing that is in most cases a contribution, at least as seen from the point of view of the submitter. But the author actually considers it an affront if it doesn't conform to the bug report template.

With the disclaimer that I have never maintained a highly popular GitHub repo, I get a lot of feedback for my projects that is unuseable, and some that is aggravating. I always have the option of simply ignoring it, and that's the end of that interaction. Perhaps the author is not actually good at setting boundaries and ends up blaming others for imposing.