I think racism involves deliberate insults and discrimination aimed at a person or group simply because that person is a different race from the accuser.
Disliking someone on the grounds of their colour or race is racist.
You cannot say that people in Derbyshire are a different race from people in Yorkshire, so your example would not constitute racism, just ignorance and bad manners.
I do not think Jade's remarks were overtly racist but I think her dislike of Shilpa had racist overtones. Jade did not like an Indian having the cheek to be better looking than her, better educated than her, richer than her and even more popular than her. That, I believe, was the basis for the hostility towards Shilpa.