These are your anecdotes - you say that the majority of people in one part of germany are racist, therefore you are justified in making sweeping generalisations about the country as a whole. My anecdote - having lived for a little while in germany, visiting quite frequently and having a good few german friends - my opinion is that what you said, about the majority of german individuals having various unpleasant character traits, is a load of utter nonsense.
You have to have a look at what you actually wrote. Maybe you just happened to word things badly, but what you wrote comes across as very dodgy which is why I ask if you have let your german relatives see the detail of what you said. It's one thing making observations about cultural norms that may cause one group of people to tend to behave slightly differently, on average, in certain situations, than another. It's another thing though to start talking about ingrained negative characteristics in the majority of a certain group of people. You specifically said "majority" and also used the word "individuals". The whole tone of your post feels dangerously close to full on racism that implies negative traits are genetic. That's why people have reacted. I realise you did not say that explicitly and may not have intended to imply anything like that but you should go and look at your wording and try and see why it skims on very dubious territory. And the word "crafty" which means getting things by underhand means. You do realise that's pretty much exactly the stereotype employed against Jews in earlier periods of German history?
I don't have a problem with observations about germany's geographical and economic position being significant in how it interacts with the rest of Europe, and comparisons of the current situation with other periods in history. But as soon as you start talking about things like personality traits - you have to be very careful. Because that exactly is the kind of stuff that excuses racism and judging people on the basis of the group you've assigned them to rather than the individual themselves. And you don't get out of it with 'some of my best friends are German' backpedalling.