I am so sick to death of hearing this "argument." Because it's irrelevant to the situation. And I'll tell you why:
In the United States,
1. Private entities are not bound by the First Amendment. That means they can host (or refuse to do so) any speech they choose, because that's the First Amendment right of all individuals and private entities;
2. The US government is forbidden to be the arbiter of speech, except in a few, clearly defined areas (advocating the violent overthrow of the government, making credible threats of violence, etc.);
3. If you don't like decisions about speech that a particular individual or private entity makes, you are perfectly free to speak out against those decisions, organize others to do so, and/or vote with your feet/wallet and don't engage with that individual or entity;
4. Unless you have a management and/or ownership role in a private organization (e.g., Twitter), you don't have the right to change their policies or speech;
5. You absolutely have the right to speak out and say just about anything, but you don't have the right to force others to host that speech on their private property. And that's a very good thing. If that weren't the case, I would have the right to blare midget furry porn or all-goatse-all-the-time projections or all manner of other offensive, hateful, disgusting things in your living room.
I'm sure many will disagree with me. If you do, please engage me in discussion in addition to taking other action -- both of which (and thank you HN for making that possible) are your free expression.