Dude you do you understand how much intra-European racism has existed from the dawn of time? How many factors within a single insular "ethnostate" people still found a way to latch onto to get their tribal jollies off on like religion and class?

Have you ever heard of the Cagots?

https://en.wikipedia.org/wiki/Cagot

Virtually nothing about them do we understand as having been in any way distinguishable from others around them in their society and yet they were persecuted for hundreds of years.

It's such a stupid instinct in people, grow out of it.