First, I clearly presented this as a hypothetical and emotional reaction and I did this purely to illustrate my feelings. Second, I obviously can not be angry about a country but only about people. Currently there are a quite a few people from the US government I see regularly in the media and they make me angry with what they say, but there is nothing special about this people being from the USA.
I have been to France once and while the overall experience was very good there was one bad experience. We had a problem with the motorway toll and stopped to ask a woman working at a toll station. She was obviously able to understand my English question but did not even try to answer in English and I did not understand a single word. This was not bad enough to make me angry but it was very impolite and I have no understanding for this, not even given the history of the relationship between France and Germany. I knew that I had to expect things like this, but it was a single exception and I am happy about this.
So no doubt that there are many people in many countries thinking of their own people as superior, but this is not acceptable in any case.