I think the only thing you can do is get slightly along side his rear quarter and nudge him around in a PIT maneuver. There isn't an official way to get these A-holes out of the races, so they unfortunately need to be sent to the shadow realm and meet Barrie-R.
I'm not so protective of my DR that I won't take out an instigator.
This driver and probably other drivers with such behavior are driving with ASM and/or countersteering assistants, which makes it very difficult to impossible to simply turn them around and by driving without such helpers I risk losing control of my vehicle for myself to lose....
Anyway I got banned from PSN yesterday, according to the email I must have uploaded inappropriate content...if this relates to this video then I can't help laughing as it wasn't even my livery and I don't share his view...
In the other case in question for this ban, I was insulted by a player in the middle of the race as "disabled person ectr", to which I reacted after the race, but this to the best of my knowledge with a level-headed and acceptable language. I could also prove that player's first insult since I saved the video... but
1. you will NOT be asked about this incident, ergo it is a dictatorship of PSN
2. I can't even present this proof now because it's stored IN THE GAME and I can't access it because of the ban.
For my part, I am deeply appalled by this behavior from Sony, I am now really convinced that it is best for me to return to this whole company, the game and the console.
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By the way, in one race, in the last corner of S4, I was hit hard by a driver behind me, as a result of which my vehicle shot the man in front into the gravel bed, I was already on the brakes, but the force from behind was just so great, that I had no chance to avoid this.
The player in front of me was on 1 at the time and I was on 2.
I got a penalty for that and the number 1 driver left the race. In principle, my race was over and the "culprit" was on 1. I can't judge whether it was intentional or a mistake, because I also left the race on lap 3. Because the player wrote to me on fire.
I explained the incident to him, which unfortunately I couldn't do anything unless I had expected what the man behind was going to do.
Anyway, the 2 of us "suffered" from this incident but now get along well and wish each other good luck in future races!