German Cross Identification

I wonder why Germans and German-Americans have a bone to pick with me racially like I did something when they marry or identify with Scottish, Italians, Scandinavians, etc.  It should make sense for them to identify with Scandinavians, pretty easily, if anyone.  I probably, besides being 1/2 Chinese/Asian, have French, Dutch, and other things in my changing DNA results.  I think my side came from possibly they said someone who had both French and Dutch before marrying German, something that seems like that I mean.  What are they really trying to say to the average American about how German they are?  I mean all this but not relating to the normal American who has some German some Irish or something.