I don’t wear a kippah in places where it is mostly gentile. I put a baseball hat on in those cases due to safety.
Most gentiles are anti-semites, in one way or another, and I want to avoid consternation. Also, they particularly object to religious Jews. For instance, I was on Staten Island 2 weeks ago and stopped at the ShopRite on New Dorp Lane to buy some cheese, crackera, ice cream, and a few other items. I know the area is mostly goyishe, so I didn’t want to expose myself to possible danger or harm.