There is nothing at all mystifying about this. The judge ruled that Twitter is a designated public forum. Under the law, no public official can deny a citizen the right to petition the government for redress in such a forum. Trump is a big boy. He can endure their criticism. That's part of the job.
False analogies. A phone conversation is private, not in a public forum. If the president wants to close a window in his building to shut out noise, that is different from denying the person making the noise his right to be heard within the public forum.
When I said this transforms Twitter to a public forum, the words "public forum" were very carefully chosen as they have a specific legal meaning.
Why do you think that Twitter is not a public forum? The judge ruled correctly that it was. Trump uses it to communicate with the public. That is the whole point of his Twitter account. He does not use it for private communications, unless maybe he his sending coded messages to Russians.
This is going to hurt Twitter. And, in about 7 years, those who are cheering this are going to be very upset at the way President Warren is treated on Twitter.
How is allowing people to post on Twitter going to harm Twitter? If a president chooses to use it as a way to communicate with constituents, that is only going to enhance Twitter's status. Speculation that a future Democratic president would behave as poorly as Donald Trump is a straw man argument. If one did, then he or she would be just as wrong.