May I ask where you are from? Free speech - bigoted, hateful, maybe untrue, or otherwise, is perhaps the one enduring (sacred) tenet of American society.
Harassment isn't. One of the big points of the article is that when law enforcement doesn't act that is justification that the action is legal and thus "free speech". Except that law enforcement almost never acts against online harassment. There are plenty of laws restricting free speech when it harms others, and I'd hope you agree that some of the examples in the article crosses the boundary into things that should be criminal.
The boundaries of harassment are very blurry and tend to favour the powerful. For example, some of the campaigns against online harassers look even more like harassment than the actions they're going after people for: http://www.spiked-online.com/newsite/article/online-trolls-w... Except that because it's the press harassing people to the point of suicide, we don't see anything wrong with it.
Not entirely true - the reaction in the UK to this whole incident has been quite negative from what I've seen. Then again, we're not overly happy with our press at the best of times...
The parent wasn't a comment about the article directly, but on a thread that was discussing acceptance or rejection of subreddits for "domestic abuse and snuff". I don't know that these constitute "online harassment".
Free speech, sure. But freedom of association, too. And accepting the consequences of one's actions.
If misogynists and abusers want to go and construct their own forums, nobody can legally stop them (as long as their discussion stops short of the various sorts of criminal speech, like conspiracy to commit). But nobody is legally obligated to support them, either.
Reddit tomorrow could say, "Welp, we're not going to host people who cause harm in way X". And that's perfectly American because they'd be exercising their own rights. That they choose to support abusers is legal, but it is well within everybody else's rights to point that out, with volume and at length.
Reddit could censor all instances of discussion featuring the phrase "hackers news" tomorrow, and it's not as if they would be brought up on freedom-of-speech charges.