In the cities it can even reach 40%. They are mostly Germans and from other European countries. The numbers are high because citizenship is difficult to get. SVP however is strong in the countryside, not in cities. Most concerns are about refugees from the middle east and Africa.
SVP are clearly racist, anti-Muslim based on past referendums and rhetoric. The european court for human rights is denounced by them as “foreign judges” who are blocking the will of the Swiss people. But no, they don’t admit to being racist.