I honestly can't tell if you're trolling or just saying completely baseless stuff.
Viking raiders didn't care about the colour of your skin, not to mention the English are visually just as light in tone. Saying it's the root of white supremacy is baseless.
I can't even tell if you're talking about Brittany or England. The Normans pushed out the Celtic bretons in Brittany but that has nothing to do with the isles where the West Germanic angles and Saxons pushed out the native Celtics. There the Normans just came up to rule.
Then the Normans did not replace anybody in England other than rulers. The angles already did that, thus "angle land." The Normans pushed out the bretons in Brittany, or northern France.
And the one thing to keep in mind with those tribes is many of them were actually mixed with lineages from the celts themselves because the britons were actively migrating down to armorica and the Iberian peninsula https://en.m.wikipedia.org/wiki/Armorica