Most Germans would never say that they’re proud to be German. Maybe they feel that, after the Third Reich and World War II, Germans lost their right to patriotic pride.
As a result, the national flag isn’t displayed as readily as in the US. In Germany, you can go for months or even years without seeing the German flag anywhere.
With one big exception: the soccer World Cup.
Every four years, Germany goes crazy, and you can see flags hanging from lots of windows, balconies, and cars.