The right to free speech in USA is quite strong and superseds most restrictions. Even opinions are treated as protected speech and libel/slander requires proving intent as well as prior knowledge that the information is false.

Compared to that, most countries with a right to speech come with responsibility and have restrictions (specially against religious/incendiary/hate speech or a mix of them as well as falsehoods such as Holocaust denial) on what you can do with your speech.

In USA, one (specially the 'right' ones) can basically go "I'm not touching you" and get into someone's face in name of speech while that is a clear incursion into ones private space in other countries