To fight anecdote with anecdote...

Moving from the UK to the US I was shocked by the pernicious levels of institutionalized racism and the undercurrent of subtle racism. It's everywhere.

There's certainly more of a veneer of tolerance here, which covers up a deep seated pathological racism, which is missing in parts of Europe, so when you experience racism in Europe it's more blatant and obvious.

What you do get a lot in Europe is a lot of discomfort with the muslim minorities - whether white, or of color - which is often falsely equated with racism (because racists are often also Islamophobic too). However it's a mistake to conflate the two. With the religious issues it's mostly a stance on the totalitarian nature of the religion and the cultural practices that adherents look to bring, which are often incompatible with accepted norms and values in those countries (particularly regarding the treatment of women).