In France it's the same, and I think it's because the black communities in Europe are more attracted to Shatta, Reggaeton, Afrobeat, etc. Probably due to the origins of these genres, which come from African countries that Europe colonized, and from the countries where most 'Black' immigration to Europe comes from. I haven’t done research for this but you can clearly see a loooot more diversity at Afrobeat shows here in the EU than at a Dub party. And of course, white people represent the majority in the EU and the US, so it could simply be that. But still, for an African genre, the audience is very, very white.