Why? If one wants to harass Musk, meeting him at the airport is convenient.

If you can afford a private jet, you can probably afford a bodyguard.

There are a few people with less money than Mush who have bodyguards.

Is there any evidence this has ever happened? I have to believe that if it has, he would have brought it up.

Clearly nothing is stopping someone from doing that anyway, but also nobody ever knows if Elon is actually on any of the three planes tracked (unless he posts about where he's going or where he is). They're not even his personal planes, they're owned by his companies and used by other people. If he's that worried about a stalker he should just charter a jet instead of flying on jets associated with him or his companies, then nobody would know.

It’s worth noting that the tracker doesn’t post destinations until, of course, the plane actually lands. You cannot use the data provided to determine where to meet him.