my brilliant colleague went to Zurich for a year to work with finance people on math problems. He said that it was not the culture to mix socially, he liked to ride his road bike in the good weather, and basically, he worked the entire year without making any friends or being social. Then he left. It was expensive for him at the time (no details) even as a well-paid young math programmer, so it was not a big financia…
And that includes Germans. I don't want to lean too heavily on the cliches, but if you come across cold even compared to Germans, surely that's a sign.
Source: German expat, living in Switzerland since 2008.