In my limited experience biking in different cultures it's quite directly correlated to how much emphasis car culture has in society. Limited experience because

In my limited experience biking in different cultures it's quite directly correlated to how much emphasis car culture has in society. Limited experience because I've only cycled in a few countries but is my main mode of transportation. In Brazil and the USA quite often I experienced aggressive drivers when cycling, actively driving closer to me on a bike while shouting to get off the road, and twice in São Paulo I got hit by a car purposefully (waiting for traffic lights and got bumped from behind by a car once, cycling uphill and a car passed me and swerved onto my side on another). While in Sweden, Denmark and the Netherlands I never experienced a single aggressive driver when cycling. In Germany I had a couple of drivers shouting at me in Berlin but given it's Berlin I can't generalise if German drivers are more adversarial against cyclists, it's a very car-centric culture though so I guess it will correlate. Just some anecdotes, unsure how much of a pattern it is, would be interesting to compare with other people in car-heavy cultures (Australia perhaps?).