Earlier quoted context omitted.
Ya, how's that constitution concept working out for the USA?
The difference between the US and every other country in the world is that in other countries, citizens believe they are given rights by their government, whereas Americans believe their rights are God-given and protect them from their government. The distinction is very different and powerful.
Consider what freedom of speech means, in practice: to me, it means "you can say whatever you want, and you will retain all of your other rights, including the right to have police protection from those who would attack you for your words".
It doesn't mean "freedom from consequences" in some magical sense where people won't react to what you say or try to punch you in the face. It does mean you can engage the system to punish them for assault, though, and that you haven't given up those legal protections with your words.
I don't think it really means that you can't be fired / deplatformed over it, either. It's a relationship between you and the government, who agrees that they won't withdraw their other supports from you for your words. It also has exceptions: we've got hate speech laws here, though what most folks don't know is that you have to be posing a pretty credible threat, inciting groups to violence, etc (so you're actually still allowed to say a wide range of things that will anger others).
Now, we can imagine a stronger free speech protection - a second layer on top of the first - that says "you can say whatever you want, and your employer is forbidden from firing you over it" - but that kind of thing hasn't been created yet. I'd support it, personally, but I can see why it's a contentious concept.