Earlier quoted context omitted.
There is also a fair amount of xenophobia inherent in the Swiss national identity. I know Germans who have lived there for 10+ years and are still considered outsiders.
Can you name a place that doesn't have that? I've lived in three different (Western) countries and felt the same thing in all of them.
Milk the hatred and distrust for the benefits (Always double-check on foreign science! ) and name it to everyone falling for it as what it is: Ancient Ape bugs. So mild mockery would be the best reaction i guess.
Social suppression seems to have failed on a large scale recently.