Excuse me for sounding daft, but I think the intensity with which you are confronted with these opinions has changed drastically. I think you're purposefully being a bit ignorant here; no one (viz: 'they') wants to cancel opinions they disagree with. However to think that false information has the same platform today that it had 50 years ago is also just plain wrong-- and whether you agree with it or not, it does shape the public discourse these days. Unless you want to erode discussions to a point where its a battle of who can fabricate the biggest claim (true or not), you're going to have to accept that in a modern information society we will eventually need some form of controls.
Case in point: https://twitter.com/0x445442 (Seems you have a problem with "Leftists" and like to retweet right wing tweets)