Hi there. First of all, I am sorry you have made bad experiences. Since I "was not there" and don´t know more about you and the particular people you made these experiences with, I can´t say for sure what has happened. read more
And sometimes I also get bad treatment by waiters or vendors or other people, but I really doubt it has something to do with my or their origin. Some people are just rude. If you want to better integrate in Munich, try to improve you German, it really helps. read more