well, I've found Flemish people and Dutch people aren't the most cheerful people in Europe so maybe I can understand how they seemed racist. I've never compared Flemish people to Dutch people so I don't know if its fair to group them together.
I can say that generally speaking Flemish and Dutch are ultra conservative. Amsterdam is one thing, the countryside is something else.
I knew several Jewish people who said Austria is the most anti semitic place they've ever been. It's good to get all these views because I find Austrians to be some of the most helpful and friendly people I've ever come across.
I find Turks friendly and recommended Turkey to some black friends, they came back telling me they had never met such racists in all their lives as the Turks. So it's good to get all view points.