The written word used to involve significant barriers that made one consider everything they said. It was also taken as a more formal medium, as it tended to be more permanent. Today, instead, you can express yourself online with next to no effort, and the majority of people write down thoughts as if they were in a verbal conversation, which has a far different permanence to it. I occasionally scroll back through comments I've even made myself on this site and have no recollection of what I was thinking or the comment when I said it. Yet there it is as a permanent record of who I am/was. Given that, I'd rather keep my controversial opinions to myself on social media, as I may not even hold those opinions in the future. I'll use meatspace discussions with friends, colleagues and others I respect to refine them, rather than the 'arena' of public opinion.
It is not in response to speech that makes people feel uncomfortable.
Instead it is in response to people attempting to dox you, target your friends and family and children, as well as possibly people's workplaces, and in the most extreme cases, make threats or attempts on one's life.
> The arena of public discourse is still open to all comers.
If your family gets threatened, and your children get stalked, due to things that you say, then in those cases I would not describe the area of public discourse being open.
All the things that I have described, are a threat to free speech, even if it isn't literally the government stalking down children, due to dislike of things that people are saying.
Read some of the commentary on this thread, and note some of the well written examples that counter your comment: https://news.ycombinator.com/item?id=27581532
It seems that what you fear is being "attack[ed] publicly." If that's the case, what you fear is that others will express themselves in a way that makes you uncomfortable. Wouldn't the cause of free speech be better advanced by defending to the death their right to express themselves, rather than by casting that expression as the death knell of modern society? If your side were to "win" this culture war, a whole lot of speech would be suppressed by new social norms. Free speech for me but not for thee.
If you walk into a bar and start mouthing off, there's a decent chance you'll get punched in the face. This is bad and a crime, but I never hear anyone talk about how it's a sign of the deterioration of free speech norms. Why is that?
This is what I mean by catastrophizing. In response to speech that makes you uncomfortable you have chosen to give up on self-expression on controversial topics (except this one apparently) and martyr yourself. But no one is forcing you to do that. The arena of public discourse is still open to all comers.
To the extent that I see any coherent position in the free-speech-substack cinematic universe, it's rather anodyne: "people should be nicer to each other." True enough as far as it goes.