Truck driver have timelines. It is totally okay, if they need to occupy the middle lane. Sometimes even the left lane. It is more rare then middle lane sitters.
But what is not okay is that the cultural habit of “don’t clog” has forgotten. People are ignorant shits these days when entering cars.
If you decide to travel via 100 kph and do not want to flow with the traffic, then just stick to the right lane and flow with the trucks?! This way you have the most fuel savings as well.