People from the north and south of England can often be told apart by how they look and sound, and north/south bias is a thing - does that make them different "

People from the north and south of England can often be told apart by how they look and sound, and north/south bias is a thing - does that make them different "ethnicities"? I mean, the whole idea that the UK is a massively racist country is so silly nobody has tried to defend it, have they? As defined in a normal way - people of very different skin colours and origins getting along next to each other - the UK does very well.