I don't have any reason to mock you, but I do wonder why you find nationality such an important factor.
Sub-groups are a huge overall benefit to mankind. They allow the world as a whole to try many different solutions to any given problem. It is an "evolutionary" solution that is incredibly undervalued by some other sub-groups. Namely Venus/Zeitgeist type groups that think the world would be much better if everyone would just get along by doing things the way our group wants them to. You never here these types say, the world would be much better if I just did what that group wants me to.
I highly value the existence of sub-groups they make the world a much better place. I like to go and visit other sub-groups learn about them and borrow/steal their good ideas. I also like to leave their bad ideas behind.
But just because the existence of different sub-groups in an absolute good, does not imply that every sub-group is equally good, or espouses equally valid opinions. It is very important to be able to compare and contrast groups, so we can borrow/share good ideas and leave behind the poor ones.
Nationalities are important sub-groups to use in examples because many people can understand your point in few words. It is completely accurate in many cases to say, "Americans are so..." because we are. You know that, and sometimes we even know it. :-)
It should go without saying that, there exist Americans that are not... but sometimes humor does not translate well between different languages. On a forum it is always good to point out when you are deliberately being silly.
In my case, I was referring to a really old joke that many Europeans seem to know. It goes in one variation:
"Heaven is where the police are English, the cooks are French, the engineers are German, the lovers are Italian, and everything is organized by the Swiss.
In Hell, the police are German, the cooks are English, the engineers are French, the lovers are Swiss, and everything is organized by the Italians."
Hence my reference to their replacing perceived bad French engineering with perceived good German engineering. At the expense of people worrying about German policing.
Cheers!