Former truck driver from germany here. Sure, you shouldn't tailgate as a truck driver. His point is still valid. There are very few good reasons (read exceptionally bad conditions) for going slower than a truck's max speed. 90% of the time, people are just not paying attention. From the truck drivers perspective, this is nearly coercion, especially where overtaking is forbidden. I once tried to overtake a car on a highway in southern Germany which went like 80 km/h. I drove a 60t mobile crane, limited to 89 km/h (like most of the trucks in Europe are). When she realised that, she accelerated and I had to stop the maneuver. Then she fell back to 80 km/h again. Rinse and repeat for two times. Guess what I did then. Hint: There was some serious honking involved, too.
Also please keep in mind there is a grey area between tailgating and starting a passing maneuver and at least in my country it is tolerated to reduce the safety distance in order to start overtaking.
Also please keep in mind there is a grey area between tailgating and starting a passing maneuver and at least in my country it is tolerated to reduce the safety distance in order to start overtaking.