Compared to the real world, HN is still a bowl of cherries.
So what. The world shouldn't be gentle padded walls and protective headgear. That's part of what's wrong with US and Western European culture: extraordinary, pathetic intellectual weakness and cowardice rather than mental fortitude and strength. The West is soft and weak mentally - constantly crying like a spoiled brat to be protected from ideas, arguments, debates, anything disliked or disagreed with - and it's only getting worse.
You could have gotten across the same message by saying something like "Sure, being rude is bad, but you shouldn't let politeness descend into agreeableness to the point where people are shying away from real conversations in order to avoid upsetting people". Same message, much better tone.
so yeah, by comparison HN is rude as hell
HN is filled with toxicity, especially if you have a thought that runs counter to the normal accepted way.