Dashcams, your friend. If you drive right, that is.
Which means defensively, so you let the azzhat go, maybe raise the finger in salute of their ignorance, but as I have been reminded, two wrongs don't make a right.
Unless you have the police cite the other individual as 100% at fault, insurance companies will subrogate and you will pay for eternity.
Wife was hit once by a driver who 'thought" they had a left turn signal. The officer that responded didn't bother to check and said that since they had not witnessed the collision, they would not write a ticket.
[the over vehcile actually hit the front wheel of the vehicle my wife was driving so you would think there wouldn't be a question]
LE friends later told me that the cop just didn't want to get dragged into court and he was letting the insurance company settle it.
It wasn't until the supervisory adjustor went to the body shop that the case was resolved. The body shop was close to the intersection and they pointed out to the adjuster there was no left turn signal. Which he could clearly see by stepping out of the office.
They settled real quick after that. REAL QUICK. Body shop people told me the adjuster was afraid we would sue AND win. So he was generous in the settlement.
But short of that, insurance companies don't care, easier for them to subrogate and each driver gets to take a hit (loss).