In New Zealand, people have long dealt with tailgaters by saying if they don’t like them going the speed limit, they can go 10-20km/hr under the speed limit (or slam on the brakes to make them think fast). As a country, we’re probably just coming to the end of being able to get away with that kind of counter-antagonism, which would escalate to who knows what overseas.
The positive about driving in New Zealand, is everyone let’s you in when you’re trying to pull off a side road into the main stream of traffic. If the first car doesn’t let you out, the second car will.
Yes that’s what I’ve done before slow down a bit , they normally get the hint and back off