Without being specific... I don't get why people even attempt to drive fairly around these "meme" players.
Everyone knows who they are, and that they're only out there to grief people; they're being enabled by people letting them race until they start to grief people. It's inevitable that they will - you say so yourself in the video - so why let them have a fair race until they do?
If everyone else pre-emptively took them out in every race they're in, they'd either soon learn their behaviour isn't tolerated or they just wouldn't be able to do this kind of late-race wankery because they'd be touring round at the back after digging themselves out of gravel eleven times.
Sure, you'd get a penalty for it (although given how crazy the penalty system is, they might get the penalty instead), but you all race clean and fair enough that it won't affect you in the long-run. And yes, it wouldn't look fantastic taken out of context and dunked on a random YT channel, but everyone knows they are the tosser, not the victim.
Nobody anywhere would blame anyone for smacking tits like this about. In fact you could probably get a good video out of it yourself
I had a race a couple of weeks ago, where I saw a driver who had a notorious reputation in GT Sport, but I hadn't seen at all in GT7.
Right away, I was thinking I needed to be careful when I got near him. At the same time, I have heard tales of chronically dirty drivers who have reformed, so I figured I'd give him the benefit of the doubt, because like I said, I hadn't seen him in a long time.
Right away, I saw him shoving other cars out of his way. He's not really very good, so I caught up and tried to cleanly get by him, and drive away. Nope, he rammed me into a wall. He continued to do what he does. I later caught up again, and got a 5 second penalty for "taking out the trash".
He received plenty of vitriol in the post-race chat. He just replied "lol" to all the comments.
My take-away was a feeling of guilt for not doing exactly what you said. I should have put him out of commission immediately, because I knew who he was, and I'm sure most of the other drivers did not. I could have given my fellow competitors a chance to have a fair race. If I see him again, he'll be punted on sight. It's for everyone's benefit.
For any interested parties, he's an American who has the same name as this "Dukes of Hazzard" character: