I'm going to honk and flash my lights at people doing 45 in a 65 in the far left lane of the highway
What makes you want to cause a scene on the highway?
I'd like to see my lights flash throughout the day.
You shouldn't drive in such an aggressive manner. You could cause an accident doing this.
In the end, if the person slows down then I'm not in the wrong.
You are in the wrong, because that aggression you're showing only creates more problems for people on the road. Driving is already very dangerous, and you could hurt someone by pushing people too far while they're driving.