If you want to be editorializing people's content then you are a publisher and then you are responsible for the content they write.
The point of social media is that each person is their own publisher and own their own words.
Oterwhise lets just regulate Twitter and FB and Youtube like a publisher and lets see them handle the lawsuits.
... and then say "no, they need to be ideologically neutral" when they act in ways you dislike.
For just about anything you want the alt-right has their "free speech" alternatives. The thing they are whining about is that the reach of these alternatives is way, WAY lower than the reach of the companies/projects of the alt-right. Almost as if the free market actually works and people deliberately choose to not engage in platforms dominated by alt-right hate mongers...
I think it's completely possible for a popular pro free speech platform to exist provided it is able to be more user friendly or have some other killer feature.
I don't think that's a good, or even workable solution. Social media companies are not public utilities.
I'm saying this as someone who thinks Twitter in general is stupid, Trump behaves like a clown on Twitter and the best outcome would be if everyone stopped using Twitter.
But you cannot have it both ways, and in that particular issue he is right.
Remember nearly everyone used to farm, including the ancestors of liberals. Today's right wing "family farmers" are the people who were most stubborn or least able to learn new things as their way of life shrank and not the representatives of farming in general.