You could blame it on me being naive and having a bit of a faith in humanity, hoping he has had enough and would just leave me be.
Yup, that's pretty much it I'm afraid. Enough time playing Open PvP multiplayer games, and you eventually come to understand that yes, there really are people out there who will go far out of their way and take personal losses in game just to make life unpleasant and upsetting for you. I'm sorry it took so long and cost you some rebuys, it's possible to learn the same thing in about ten minutes of playing GTA Online.
It's also worth bearing in mind that these people are why it's so hard to fix the problem. Surely, people say, it can be fixed by just making a PvE mode where, ooh, player weapons can't damage player ships? Nope, griefers will just ram people to death instead. Introduce the rule that if you somehow, via ramming, cause another ship to be destroyed in a station no-fire zone? They'll ram your Anaconda with a Sidewinder and get you shot by the station for killing
them. Introduce the speed limit thing? People discovered that they could ram people from behind, pushing them over the speed limit, dying themselves and getting their targets shot by the station. Even if FD completely disabled player-to-player ship contact
altogether the griefers would probably come up with something like, ooh, interposing a couple of Condas in front of the mailslot to try to get people to crash into the toastrack or other ships coming in and out that they couldn't see. They're often disturbingly ingenious in their endless quest to make other people suffer for their own amusement.
And now, because of these people, I have to go Solo in order to be able to play normally? Well, I guess that's the reality I will have no other choice but to accept.
Or, join Mobius. That's why it exists...