It has to do with denying citizens access to information from the government. So it would probably depend on whether public officials are using an account for official government usage or if it is personal.

This is a legitimate question and should not be downvoted.

Public officials would be fine blocking people on their personal accounts as long as they draw a clear line between their personal and official accounts. Trump ran afoul of the law here because he didn’t do that.

> Does this mean all public officials are not allowed to block twitter users?

If the use of their account meets certain legal criteria which make it a limited public forum, yes; that's generally true of official government accounts, whether of an office or office holder, but can be true of notionally personal accounts if used for government purposes (as the court has evidence, including White House statements, was the case for Trump's “personal” account.)

Note that while Trump's Twitter account is the highest visibility case on this issue, there have been a number of similar cases regarding local government offices and officials accounts on various social media platforms with the same general result before the case about Trump's account was filed.

I suspect that, just like you have physical guards protecting official buildings from abuse, and their right to evacuate disruptive citizens has been established, there will be a case of a (probably local) government account willing to flag, or block a very annoying troll.

The peculiarity of this case is more that Trump’s thin skin and refusal to understand how the First Amendment applies to him.