> I think what she meant that even if you live in Germany/work with German colleagues, basically you will enternally made to be felt that you are not one of them by all but the most liberally minded Germans (and even those are rare even in the big international cities). So your friend group (if you decide to have one, rather than concentrate on family), will consist of other expats/immigrants.
Thanks for your interesting point.
Nevertheless, I think the situation is a little bit different:
Many Germans indeed also have the feeling "that [they] are not one of them", but I would say it is part of the German mentality to worry much less about that than in other countries.
A lot of connections at work are rather "communities of purpose" [English translation of "Zweckgemeinschaft(en)"], i.e. you work together because of a common goal/hobby/... which makes collaborations a really good idea.
I read somewhere that in the USA a lot more of the social life is centered around the work/company than in Germany. So, it is not untypical to get social connections at work, but this is only one way among many. I would even claim that the social connections from work are often not the most important ones.
Immigrants who are used to the US mentality that work is much more important for social connections than in Germany thus feel that "[they] are not one of them", when in reality this is not the case.
I am very certain that typically German colleagues treat immigrants colleagues as they would treat their German work colleagues (as far as possible). The misunderstanding is rather that many people from other cultures want to be treated quite differently.
> So your friend group (if you decide to have one, rather than concentrate on family), will consist of other expats/immigrants.
In my observation the reason for this is rather because many migrants have very different wishes on their surrounding group than what is common in Germany (also and in particular for Germans).