I don't want to get into too much of a discussion about it, I'm not Cornish, I'm from just outside London but lived here about 18 years. I've made many good friends but equally I have friends who will never fully accept me because I'm an outsider. If I didn't have white skin, I'd likely have no friends at all.
Coastal towns are better because of the annual influx, they've 'adjusted', some of the inland ex mining towns can be quite daunting.
It's improved in recent years, but I still see and hear things that shock me.
Having an Irish heritage has helped, some see me as a fellow Celt.
In terms of being racist, it's probably on a par with North Wales.