We've had the entire world under our own cultural "attack" for the last few centuries, all that's happening is that many more white people have started to receive culture from other ethnicities over the 20th and 21st centuries and it's finally hit the point where actual racists and nationalists are getting itchy and they've got the perfect economy and political playing field to exploit - rural disenfranchisement has left swathes of white people wondering where their 'good old lives' went... rather than seeing that they are suffering from the same flow of income to the upper echelons of society, they think it must be a result of the parents of the Black family down the street getting a proper contract of employment.
Just like with Brexit and Trump getting elected, the real racists and nationalists are incredibly adept at controlling the conversation so that regular, non-racist white folk are duped into thinking there is a War on Christmas, that the Muslim 1% of the nation is about to force Sharia law on the rest of us or that #blacklivesmatter think #whitelivesdontmatter