Why do many northern europeans think southern europeans are "less" racially White?

If northern europe was physically located in southern europe,I'm very sure they wouldn't think that way.The very warm climate in southern europe is what makes many southern europeans olive complexioned or tan in color.
Update: Us southern Europeans are WHITE,and we dont have to prove our Whiteness to anyone
Update 2: Us southern Europeans are WHITE,and we dont have to prove our Whiteness to anyone
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