Elon’s contact info was not shared publicly with millions of people. The location of his private jet, which is public information, was republished on Twitter.

The GP's argument is that if any information is publicly available, it's ok to repost it as much as you want.

Even your comment emphasizes the concept of "public information"

Most of us have the ability to drive to someone's house. Most of us do not have the ability to intercept a flight or gain access to the secured area of an airport.

If I am using my real name, and if I am aware that my address is publicly listed, why not? If I worked in an office and made that information public, would I be expected to be upset when someone publishes the address of that office on Twitter?

Now, if I'm pseudonymous, that's a different matter: someone would be revealing my real name's association with that pseudonym, which may be a problem.

Huh, I wouldn't be okay with it. I'd find it quite disconcerting. I'm talking about posting my home address. Work address I wouldn't care about.

To each his own.