Within reason.
The line is very clear: You have those rights ... so long as they do not encroach on the freedoms of others.
If someone wants to say there is a master race, the earth is the center of the universe, Elvis is still alive, etc... Sure: they're free to say it. But people who know better are also free to debate them - and prove them wrong. Like it or not we are better for it having the discussion. Recall that at some point people were put to death for expressing beliefs that opposed the norm in science and religion. It is important to debate and not silence people - repression breeds hate and promotes an us vs them mentality. It results in echo chambers.
Are there people that simply cannot be reasoned with? Yes. But it's important to engage with them and be a dissenting voice. It's important to demonstrate clearly that someone opposes their viewpoint. Important to the unreasonable person? Probably not. Important to those who are listening? Yes. If you do not engage- all those who are listening hear is the viewpoint of the ignorant and the apparent silence of the indifferent.
Moderates fuck this up frequently... and I'm saying this as someone who, in many cases, considers myself a moderate.
Edit:
It's been a busy day but I finally have time to sit and read through the rest of the comments in this thread. What an interesting result.... genuinely. Lots of people expressing their own beliefs and their interpretation of things I said. Not everything lined up and not everyone agreed... but this right here is what we need more of. Good stuff 🍻