Hah! This guy must not use the web often. Also, for a guy who eventually hopes to sell ads on the Reddit platform, he's not doing a great job of putting lipstick on the pig.
Additionally, HN is far, far less intelligent than its users would have you believe, but that circles back to the edgelord libertarianism again.
Usually, this is taken care of through the courts, wherein the judicial system punishes people for crimes -- again, an act of violence. However, in the absence of punishment or a judiciary aligned with the interests of oppressors, the oppressed are morally justified in enacting punishment and responding to violence in kind.
[1] Paulo Freire, Pedagogy of the Oppressed, 1967.
You might want to ask a black person or an Indian for their perspective on this.
But of course with reddit, it's 100% up to you to make it good. Find the right communities, ditch the wrong ones, and you're going to have a great time.
"All over," no--it's mostly, though not always, contained to the topics at hand. Most times that Sheryl Sandberg or Ellen Pao or any group that would maybe like to encourage people who are not dudes to learn to code and maybe get a job come up, this has historically bubbled up. Similarly, topics that do not revolve around white (and occasionally South and/or East Asian) men usually come with a sidebar of pseudoscience-cloaked racism or the blurfing of "equality of opportunity" with its implications of inferiority.
It has certainly improved since 'dang and 'sctb took the reins. And you can't be an overt meme-turd here and get away with it. But adjusting one's pince-nez and well-actuallying into sexism and racism isn't really better, and on that HN has a ways to go.
As for bullying, I think we can all agree that vote-brigading, doxxing, trolling, and racist speech are far more prevalent on reddit than HN. /r/fatpeoplehate, /r/the_donald, /r/roastme, /r/murderedbywords being some good examples, not to mention incels and redpillers.
And yes their blindside is a persistent market failure, that I sadly cannot take advantage of.
Also what Tuff said applies more readily to various chans, less to reddit, which usually has more civilized discussions - A natural by-product of trying to piss off preferably less than 50% of the userbase with each post.
In the physical world you don't have to put ads directly next to the KKK, but if there's still some sort of demonstration passing your ad nobody is going to blame you for it there either.
Also the notion that the same people who use a website are going to blame an advertiser for advertising next to content that is the norm there, is just weird.