You clearly misunderstand what the First Amendment is about. It's a restraint on government, not a restraint on everyone else.
Around 1865 we reached the conclusion that it is the duty of the Government to protect some people from having their freedom taken away by some other people. Since then the Constitution started imposing restraints not only on the ability of the Government to curtail your freedom, but also the ability of your fellow citizens to do so. And this is a good thing.
But lately we started regressing. I'm talking about the cancel culture.
Do you think that if one day a person were to be physically tarred and feathered by a crowd of puritans because of some perceived transgression, that is ok? But then if the tarring and feathering is in the digital world, and much more permanent (nothing is forgotten on the internet), is that ok?
The end result is that people learn there are some things you can say, some things you can't, and some things you must say.