A reader suggested that xenophobia could be related to economic prosperity, with more prosperous societies being more "tolerant".
To test this hypothesis, I regressed GDP per capita income (from the CIA World Factbook) with "Resistance to Multicultural Society" taken from the recent report on European attitudes. I dropped tiny super-high income Luxembourg, averaged the two German regions, and used Great Britain as representative for the United Kingdom.
The result? A slightly negative, statistically not significant correlation of -0.12.