Its a good lesson. Its also more complicated because where she relocated in America doesn't even represent a lot of America in general, so there are so many different places that hold different standards in general.
But with that being said, it is a good lesson...she actually learned tolerance despite being in one of the most intolerant environments. She was able to understand that someone's environment can easily shape how they act and react to things and situations. So when she went back to Germany, she even took that with her and actually learned a lesson about her own home environment and how they think about the US and what they see in the news as well.