So three things jump out at me here:
1. You need to adjust your rear camera
2. You weren’t kidding when you said he was tailgating! That’s ridiculous, what a prat. No need for it at all.
3. And this falls well down the scale of things that are wrong, and I’m assuming that’s NSL there, but sub 30 is also a silly speed and no wonder he had the hump.
Please don’t take my last comment too harshly, I’m not for one moment suggesting you deserved him driving like that, but I can totally understand his frustration. Still not sure I’d bother reporting it as that kind of driving happens every single day, but I can see why you feel aggrieved.
Also thank you for sharing