Why do european people eat french fries with mayonnaise?

Here in us, people eat french fries with ketchup aka tomato sauce most of the time, but when I went to amsterdam, french fries are served with mayo on the top. Does europeans basically hate to eat french fries with ketcup like american style? For me, I like eat french fries with both american and european styles.... show more Here in us, people eat french fries with ketchup aka tomato sauce most of the time, but when I went to amsterdam, french fries are served with mayo on the top. Does europeans basically hate to eat french fries with ketcup like american style? For me, I like eat french fries with both american and european styles. Just wanna know why europeans think mayo is good for french fries.
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