His last name is unique as well, and would generally by how e.g a news org would refer to him. I still get the sense there is a certain type of post that uses the first name exclusively, either (maybe less now) a tech-bro-type implying familiarity, or now an outraged tech-adjacent type wanting to mildly show their superiority. Ymmv, it's just the impression I get, especially if you look at the content of posts that refer to him this way

I've seen people routinely feign outrage over people not addressed as "Dr" (which as someone with a PhD I think is ridiculous) - even though it's clearly a minor thing, I think people seem fine trying to subtly disrespect Musk through how he's addressed