If you have an objection to this tracking, you'd have to take it up with the FAA. Because the legitimate interest is that the rules require airplanes to transmit this information any anyone is free to listen to it.
Which is a great thing for aviation safety, so I'm glad the rules exist.
I mean, that particular individual is in turn weird and not okay.
But who am I to say? And what does it matter if something is weird and not okay? Lots of things fit that bill, and that doesn't mean they shouldn't exist.