This seems so totally out of character for Elon that I can only assume he is drugged or mentally ill. Maybe he's Ambien tweeting. If he's still in southeast asia, that would make sense (as he'd be tweeting around midnight local time).
I follow Musk on Twitter and I've never seen behavior like today. Yes, he sometimes insults people, but there's a huge difference between offhand insults and sticking to your guns accusing a rescue diver of being a pedophile.[1] It's utterly bizarre.