Why do people care about what kind of white you are?

I've talked to guys (they were blonde guys by the way and called themselves vikings lol) who were worried I wasn't white enough to date lol and have kids with. They said it mostly in a silly way.. but you can tell there's some truth behind it. I'm white for sure but I guess I'm not white enough? 😆
one guys brought it up cause I mentioned that my dad has dark skin and black hair and I thought he was joking BUT HE wasn't. ITS SO WEIRD.
Do certain white people think they're above THE OTHER WHITE PEOPLE?
Why do people care about what kind of white you are?
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