Musk isn't used to being told “no”. I mean, c’mon, the guy just had the US start a Space Force, with tacit approval from the President to shoot for the stars. I love how Trump said that anyone could go into space, put all that time and money into it, and then the US would take credit for it.
I think Musk is on the spectrum a tad...I usually cut geniuses some slack. In this case, however, no slack. Musk owes the cave guy an apology, delivered in the same manner as the insult.