Your timescale suggests they literally raced to cut you up, forcing you to take evasive action.
I've lost count the number of times I've had this done to me, even on a motorbike. If you can, I would recommend riding primary to (hopefully) deter idiots like this. If the idiot can't or won't drive safely then they shouldn't be driving. Hopefully they'll "belt up" before they kill.
Idiotic driving. Aggressive and intentional. Like he said in the video, the driver doesn't think, goes to undertake which is illegal unless built up traffic, then speeds passed. Dangerous driving.
Don’t sit in the fast lane pillock