My argument was that your right to freedom of speech does not compel others to publish your speech.
If you send me an e-mail with your opinion and the instruction to forward it to all my contacts, then I am not violating your freedom of speech by refusing to do so.
And yes, freedom of speech does not protect net neutrality. That's why we need the FCC to set those rules and enforce them.
What some people are arguing for is a sort of "opinion neutrality" for social media companies that forces them to treat all opinions equally without moderation.
You can certainly debate the pros and cons of such a rule, but it's not a consequence of your right to freedom of speech.