It seem the rules for overtaking are the first thing people forget when they gotten their license.
And forcing your way thru to get the front of your car 1 foot in front of the car on your side are not it, that's actually illegal according to Danish law.
Also breaking the speed limit to pass a car, that's also a no go.
you can overtake when traffic allow for it, and when there are a hole up ahead you can merge into without being a nuisance to the other motorists.
In cases like this i wish i was able to pull out a scattergun and rest it in the open window.