Speech doesn't hurt anybody and it equates to a disgusting thought-crime in my book to censor it.
If someone is racist, hateful, or just plain stupid and refuses to believe the facts then you should talk to them and try to convince them of them.
If they become hostile to you, or generally show their depravity, then there's nothing wrong with saying the truth about how you feel.
However, that changes when you use that speech to cause terror or you personalize it and try to attack who somebody is and truly cause problems for them.

Yesterday I was called out and attacked by some idiot who said I threatened to murder him after I pointed out the depravity in what he linked and shredded his argument.
He instead of having a discussion with me he insulted me relentlessly and mocked me, while I simply asked for his resources.
He then posted a guy that talked nothing of value and I asked him that, then towards the end of the video that speaker made comments on how the earth is overpopulated and we can't feed people in the way he wants in a sustainable way, answering someones question in the crowd, in which he behaved as such that he wants to kill off the majority of the human race so that his sick way of eating that he's justifying off no evidence at all can continue.
That's sick, demented, selfish, etc.
So I said the truth: In the future those people will probably be lined up and shot.

Again in the next reply to me he provides no evidence, says he's not going to be civil with me, wishes death on me, and generally spouts hatred. He says he muted me.
I reply, once again, honestly. He would likely be one of those people, and thus I informed him how he would probably be shot in the future because of the damage he's causing and his refusal to change.
Rather than muting me like he said, and rather than listening to what I said or proving me wrong this entire time, rather than saying it was a misunderstanding and that I was wrong, he continues to be belligerent and then he goes off to make the hit-post i linked above lying about what happened.
He earned over $10 from his post and comments against me as well as got a couple users I was friends with angry with me. Nobody seemed to listen to the other side or bother because of the sick politically correct hugboxes facebook and the like have brought into reality.

Sorry but any limitations on free speech that's not broad is just another excuse to abuse the populace.
If somebody is a vile sick piece of shit you have the right and should tell them how it is.
If someone is hurting somebody else, you have the right to hurt them to stop that crime and you should, and if you do you're a fucking hero regardless of what the law says.

What I said was not anti-free speech, nor a threat, it was a statement and a prediction.
As I said there, **if I say "you will probably get heart disease and die in the future if you don't change your lifestyle" is it a threat?
This is the stupidity and anti-free speech that exists in society today, and that's what needs to stop.
Not some idiot reactionary spouting his bullshit.