Fast car culture is not unique to Germany. The Autobahns are designed for higher speeds than US highways, generally.
I have driven there. It might un-nerve many Americans.
This driver could have been unskilled, took dangerous chances, lost control etc.
In 1970 I had a new car able to reach about 110 mph. Usually drove about 100 mph.
One day heading north towards Frankfort airport, a large BMW closed on me fast from the rear, flashing headliights to warn "move ritht," which I of course did.
As he went by me going about 120 mph, there was a 911 Porsche on his rear, flashing headlights warning him to move right, which he did, as the Porsche flew by doing bout 130 mph.
That took about 5 sec. or less.
When in Bavaria, do as the Bavarians do: Schnell Fahren.