The guy was merely corroborating the original post, sharing some of the absurd things he was taught in school, and was downvoted for it. Doesn't seem like a very friendly thing to do to someone who's engaging in the discussion.
Shall we stand by mute while someone is bullied? Either that or be bullied ourselves for speaking up to stop it? If that's it, then I don't like your policies. I re-edit the post to conform to your policies. Then I'll show myself the door, thanks.
HN members usually downvote when something is incorrect, even if it was not my fault but the teacher who taught me that.
I usually make mistakes and get downvoted for them. What I was taught about Windows NT had some inaccuracies in it and got downvoted for that. If you look at my history every once in a while I got downvoted and get used to it. But I get upvoted more than downvoted so it averages out.
https://news.ycombinator.com/newsguidelines.html
https://news.ycombinator.com/newswelcome.html