Actually, the variable that makes racism in the US so elastic s not white wealth — it is the concentration of wealth at the top — which when it effects the white middle or working classes, then results in a very elastic situation in the US. White Americans, first and foremost, blames minorities for any economic woes, seldom ever blaming the accumulation of wealth at the top as the problem.
As for Germany, racism is very prevalent in the East. In Austria, where I have a residence and spend a good part of the year, I would not say is overtly racist toward Black people. Arabs definitely yes, though. In the UK, where you live, you know the situation much better than me. But, I see a lot of racism there among the Brexit supporters.