Well, it's interesting:
France also runs a substantial trade surplus with the United States, and it, like Germany, falls short of the military spending benchmark set by NATO, though in both cases by less than Germany. Yet Mr. Trump has spared France the kind of vitriol he has given the Germans — largely, officials say, because France spends more on its defense than Germany.
...
Germany spends only 1.2 percent of its gross domestic product on defense, compared with 1.8 percent for France. Both are below the 2 percent threshold that NATO has set for its members.
https://www.nytimes.com/2017/05/30/world/europe/trump-merkel-germany-macron.html
But the difference in monetary terms isn't all that big at all
Besides:
In his conversation with European Union leaders, Mr. Trump reportedly complained about the millions of cars that Germany sells in the United States, and threatened to stop them. Yet he has been an enthusiastic buyer of German luxury cars over the years.
After his Palm Beach wedding in 2005, Mr. Trump and his bride, Melania, jumped into a Mercedes Maybach limousine. He once bought a limited-edition silver Mercedes SLR McLaren roadster, with a supercharged AMG V8 engine, for $465,000. Mrs. Trump had her own Mercedes at the time.
Don't see Tesla there just yet.
Our dinky 17 million people Netherlands is the 3rd largest foreign investor in the USA. Germany is 6th. Most in the top 10 are European countries. Investments can be moved.