First, Vern had just gone through weeks of hell trying to save those boys. Again, he is a
hero. He was there searching as the cave was flooding. He recruited the British Navy to come to their rescue. He knew the cave extremely well.
Second, grow up. If someone insults you, don't stoop to their level. Elon is CEO of a 50B+ public company; he could have spun this into "look how amazing our engineers are."
Third, it's a shitty appology. It's in Twitter at midnight in response to a tweet that was basically mocking journalism. He tries to create an equivalence between their two insults when they aren't equal.
Elon has media training, a huge PR team, and 22M Twitter followers.
5 weeks ago, Vern was a nobody living in Thailand, with no media training, and limited social media experience.
Here's a more professional appology:
I want to appologise to Mr. Vern. Earlier this week, I foolishly stated that <defamation>, in a now-deleted Tweet.
I was stressed after working intensely with the SpaceX team to ensure the divers had a viable backup plan. After seeing Vern's comments late at night, I lashed out.
It was a childish comment that was completely baseless, and I sincerely regret it. Mr. Vern worked tirelessly to see to those boys rescue. I hope he will forgive me.