I recently did a lot of research into this as part of a project. As far as actual laws on the books (and not whatever one's political opinion of how they tend to be applied), the U.S. isn't just "one of" - it is literally the only country in the world matching descriptions like "first-world", "liberal", and "democratic", that does not have some variety of broad, nation-level laws against insulting people or groups of people. Aside from the U.S., only a handful of completely random small countries happen to lack such laws.

So, as far as I can tell, the U.S. is practically unique in having the most liberal free speech protections, and actually unique among any countries that could be considered peers.